CN103913401A - Method for measuring migration depth and apparent migration coefficient of chloride ions in concrete - Google Patents
Method for measuring migration depth and apparent migration coefficient of chloride ions in concrete Download PDFInfo
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Abstract
The invention discloses a method for measuring the migration depth and the apparent migration coefficient of chloride ions in concrete. The method comprises the following steps: selecting a cylindrical test piece by performing core-drilling on a concrete structure to be detected; horizontally arranging the selected cylindrical test piece, splitting the cylindrical test piece along the direction parallel to a penetration surface until the test piece is completely split; spraying 0.05 to 0.2N silver nitrate solution by a vertical section spraying method, wherein the spraying amount is 200 to 400 ml/m<2>, and the ambient temperature is controlled to be 20 to 25 DEG C; after the silver nitrate solution is sprayed for 10 to 40 minutes, drawing a color-changing boundary clearly by using a fountain pen, testing a color-changing depth value every 0.5 to 2cm, and averaging the tested color-changing depth values; according to the obtained color-changing depth value, the Fick's second law, and the water-cement ratio of the concrete, selecting the concentration of the chloride ions at the color-changing boundary, and calculating an apparent diffusion coefficient, wherein the limit chloride ion concentration of the corrosion of a reinforcing steel bar can be used for calculating the remaining life of a detected object.
Description
Technical field
The present invention relates to unstable state transport coefficient experimental technique field, be specifically related to a kind of method of measuring Chloride Ion in Concrete Transfer Depth and apparent transport coefficient.
Background technology
The Important Project life-span degradation that concrete structure durability problem causes causes slip-stick artist and scientific research personnel's extensive concern day by day.As everyone knows, cause the principal element of the endurance issues of xoncrete structure to have: Chloride Attack, sulphate attack, freeze thawing circulation, carbonization, alkali, fresh water corrosion and erosion, stress rupture etc.Wherein, reinforcement corrosion causes the destruction of xoncrete structure, the problem that has become whole world common concern and become increasingly conspicuous.And the steel bar corrosion that chlorion causes accounts for wherein 80% left and right.Due to the popularity of chlorion existence and the seriousness of destruction, it is the main factor that causes reinforcement in concrete corrosion.
The endurance issues causing for the Chloride Attack of cement concrete, how to develop fast chlorion migration measuring method, can measure rapidly ion penetration resistance of concrete energy and chlorion migrate attribute in cement-based material is significant.The measurement of unstable state migration need to be measured in cement-based material chlorine ion concentration in time and the situation of change of position.Measure object in order to reach this, certain time that need to be after chloride permeability, cement-based material test specimen, along chloride permeability towards successively sample analysis chloride ion content wherein of infiltration forward position, is drawn to the distribution curve of chlorine ion concentration along length of penetration.Two kinds of methods of at present conventional unstable state transport coefficient test, NT Build492 and NT Build443 have all used the chloride permeability degree of depth and corresponding chlorine ion concentration value in the time asking for unstable state chlorion transport coefficient.But successively sampling test complex steps is also higher for the requirement of equipment, has certain limitation in the application of Practical Project.Meanwhile, the variation range of parameter variable color border chlorine ion concentration of measuring due to silver nitrate development process is very large, and this has greatly limited the accurate application of silver nitrate development process.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of method of measuring Chloride Ion in Concrete Transfer Depth and apparent transport coefficient is provided.The present invention is simple, and processing cost is low, and applicability is strong, can be widely used in measuring the apparent transport coefficient of chlorion in various concrete free diffusing situations.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method of measuring Chloride Ion in Concrete Transfer Depth and apparent transport coefficient, comprises the following steps:
(1) the xoncrete structure detecting from needs, boring core chooses the concrete cylindrical test specimen after free diffusing test, also can be at the other right cylinder test specimen of placing of newly-built xoncrete structure, or right cylinder test specimen is soaked and carries out nature diffusion experiment in sodium chloride solution, by its horizontal positioned of right cylinder test specimen of selecting, along the direction splitting parallel with penetration fact, open to the complete splitting of test specimen;
(2) adopt vertical profile spray pattern, spray 0.05～0.2N liquor argenti nitratis ophthalmicus, sprinkling amount is 200～400ml/m
2, environment temperature is controlled at 20～25 ℃;
(3) spray after liquor argenti nitratis ophthalmicus 10-40min, it is clear with water-color paintbrush, variable color border to be described, and is then close to test specimen side with ruler, every a variable color depth value of 0.5～2cm test, averages.In the time that causing that the coefficient of variation exceedes 15%, certain variable color degree of depth casts out;
(4) according to the variable color depth value obtaining, select variable color border chlorine ion concentration according to concrete water cement ratio simultaneously, according to Fick's second law or energy Si Te-Planck equation, calculate chlorion unstable state diffusion (apparent diffusion) coefficient and unstable state transport coefficient.In the time calculating apparent diffusion coefficient, test specimen surface chlorine ion concentration is got the thick top layer of test specimen 1mm chlorine ion concentration.The chlorion apparent diffusion coefficient obtaining is combined with Fick's second law, and the limit chlorine ion concentration of binding reinforcement corrosion can be used for calculating the residual life of detected object.
The preferred technical solution of the present invention, the concentration of silver nitrate is 0.08～0.15N.
The preferred technical solution of the present invention, silver nitrate sprinkling amount is 240～360ml/m
2.
The preferred technical solution of the present invention, waits for that the time of silver nitrate colour developing is 20～30min.
The preferred technical solution of the present invention, measurement variable color depth value is got and is a little spaced apart 0.8～1.5cm.
The present invention has formulated a kind of new process of measurement, consideration chlorion apparent diffusion coefficient and surperficial chlorine ion concentration are determined, the condition that silver nitrate development process produces the reason of difference and accurately measures for measuring chlorion apparent diffusion coefficient, perfect silver nitrate development process replaces successively cutting sampling and testing method (Profile method) that NT Build443 uses to measure the theoretical foundation of apparent diffusion coefficient.
The silver nitrate development process test routine the present invention relates to is by silver nitrate sprinkling amount and spray pattern in Control experiment process, and select different variable color border chlorine ion concentration values according to concrete water-cement ratio, reduced the undulatory property of the test findings of silver nitrate development process, the apparent diffusion coefficient that test obtains has certain precision.
The present invention has following beneficial effect:
(1) constructing operation is easy, and test fast and have certain precision; Improved existing commercial measurement silver nitrate development process measure variable color border chlorine ion concentration difference excessive, cannot represent the deficiency that variable color border chlorine ion concentration removes accurate Calculation chlorion migration/coefficient of diffusion by a reasonable value;
(2) the silver nitrate colour developing process of measurement of setting up can detect less variable color border chlorine ion concentration, improved in existing method of testing, occur can not there is the situation that variable color border does not manifest;
(3) guaranteed that variable color border chlorine ion concentration fluctuates in more among a small circle, the coefficient of diffusion error calculating is in 5%.
Accompanying drawing explanation
Fig. 1 is silver nitrate development process and the relatively schematic diagram of apparent diffusion system that successively cuts the measurement of sampling and testing method.
Embodiment
Below by specific embodiment, the present invention is further elaborated.Must not should be noted that following embodiment is interpreted as to the restriction to content of the present invention.
Embodiment 1
The embodiment of the present invention 1,2 all adopts concrete sample to carry out nature diffusion experiment, and soak solution adopts 3.5%NaCl solution, and soak time is 300 days.Test match ratio is as shown in table 1.
Table 1 embodiment 1,2 concrete mixs
Reach after immersion length of time of experimental design, according to NT Build443, adopt successively cutting sampling and chemico-analytic Profile method to measure the chloride ion content of every layer of sample.Say that right cylinder test specimen is fixed on cutter lathe, adopt the successively dry powder that cuts of cutting machine.Every layer is got powder thickness is 1mm.The powder obtaining adopts acid-soluble method to measure the chloride ion content in powder, according to least square method and formula (1) calculation testing piece apparent diffusion coefficient.
Wherein, C (x, t) is the chlorine ion concentration at time t and degree of depth x place, C
ssurperficial chlorine ion concentration, C
ithe initial chlorine ion concentration of test specimen inside, D
appbe chlorion apparent diffusion coefficient, be also called unstable state coefficient of diffusion, erf is error function.
Embodiment 2
(1) right cylinder test specimen is soaked in 3.5%NaCl solution after 300 days natural diffusion experiments, by test specimen horizontal positioned, top center applies a power, and below respectively applies anchorage force at 1/3 place, along the direction splitting parallel with penetration fact, opens to the complete splitting of test specimen;
(2) adopt vertical profile spray pattern, spray 0.1N liquor argenti nitratis ophthalmicus, sprinkling amount is 300 ± 60ml/m
2, environment temperature is controlled at 20-25 degree Celsius,
(3) adopt ruler method to measure the variable color degree of depth.After spraying liquor argenti nitratis ophthalmicus, approximately after 10-30 minute, depend on experimental situation humidity conditions to determine, while seeing test specimen section without washmarking, it is clear with thinner water-color paintbrush, variable color border to be described, then be close to test specimen side with ruler, every a variable color depth value of 1cm test, at least test five depth values, then averaged, if specimen width is enough large, reads as much as possible and get effective value.While averaging, in the time that certain variable color degree of depth causes that the coefficient of variation exceedes 15%, cast out, again average.
(4) according to the variable color depth value obtaining, according to Fick's second law (formula 2), calculate chlorion apparent diffusion coefficient, test specimen surface chlorine ion concentration is got the thick top layer of test specimen 1mm chlorine ion concentration.In the present embodiment, concrete mix is 0.35, and variable color border chlorine ion concentration is got 0.2N.
Wherein, X
dit is the chloride permeability degree of depth that silver nitrate development process records; C
dthe variable color border chlorine ion concentration that silver nitrate development process records, C
ssurperficial chlorine ion concentration, D
appbe chlorion apparent diffusion coefficient, be also called unstable state coefficient of diffusion, t is open-assembly time, and erf is error function.
The chlorion apparent diffusion coefficient obtaining in embodiment 1 and embodiment 2 the results are shown in Table 2.From Fig. 1, adopt method of the present invention and successively cut the data that sampling and testing method obtains and relatively can find out, the chlorion apparent diffusion coefficient that the test procedure that this patent provides obtains and the existing powder of need to successively getting carry out the data that chemico-analytic method obtains and have good consistance.Compared with successively cutting the test figure that sampling and testing method obtains, the apparent diffusion coefficient error obtaining is controlled in 5%.
Table 2 silver nitrate development process and the apparent diffusion coefficient value of successively cutting the measurement of sampling and testing method
Note: test specimen, under 20 ℃ of environment, soaks 300 days in 3.5%NaCl solution.
More than show and described ultimate principle of the present invention and principal character.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (5)
1. a method of measuring Chloride Ion in Concrete Transfer Depth and apparent transport coefficient, is characterized in that: comprise the following steps:
(1) the xoncrete structure detecting from needs, bore core and choose right cylinder test specimen, also can be at the other right cylinder test specimen of placing of newly-built xoncrete structure, or right cylinder test specimen is soaked and carries out nature diffusion experiment in sodium chloride solution, by its horizontal positioned of right cylinder test specimen of selecting, along the direction splitting parallel with penetration fact, open to the complete splitting of test specimen;
(2) adopt vertical profile spray pattern, spray 0.05～0.2N liquor argenti nitratis ophthalmicus, sprinkling amount is 200～400ml/m
2, environment temperature is controlled at 20～25 ℃;
(3) spray after liquor argenti nitratis ophthalmicus 10-40min, it is clear with water-color paintbrush, variable color border to be described, and is then close to test specimen side with ruler, every a variable color depth value of 0.5～2cm test, average, in the time that certain variable color degree of depth causes that the coefficient of variation exceedes 15%, cast out;
(4) according to the variable color depth value obtaining, select variable color border chlorine ion concentration according to concrete water cement ratio simultaneously, according to Fick's second law, calculate chlorion apparent diffusion coefficient, test specimen surface chlorine ion concentration is got the thick chlorine ion concentration of test specimen top layer 1mm, the chlorion apparent diffusion coefficient obtaining is combined with Fick's second law, and the limit chlorine ion concentration of binding reinforcement corrosion can be used for calculating the residual life of detected object.
2. the method for measurement Chloride Ion in Concrete Transfer Depth according to claim 1 and apparent transport coefficient, is characterized in that: the concentration of silver nitrate is 0.08～0.15N.
3. the method for measurement Chloride Ion in Concrete Transfer Depth according to claim 1 and 2 and apparent transport coefficient, is characterized in that: silver nitrate sprinkling amount is 240～360ml/m
2.
4. the method for measurement Chloride Ion in Concrete Transfer Depth according to claim 1 and apparent transport coefficient, is characterized in that: the time of waiting for silver nitrate colour developing is 20～30min.
5. according to the measurement Chloride Ion in Concrete Transfer Depth described in claim 1 or 4 and the method for apparent transport coefficient, it is characterized in that: measurement variable color depth value is got and is a little spaced apart 0.8～1.5cm.
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Cited By (11)
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| CN104088472A (en) * | 2014-07-10 | 2014-10-08 | 汕头市建设工程质量监督检测站 | Method for detecting and restoring reinforced concrete structures of coastal building |
| CN104181081A (en) * | 2014-08-11 | 2014-12-03 | 东南大学 | Test method for representing influence of aggregate base material interface of cement-base material on carbonization speed |
| CN105717000A (en) * | 2016-04-18 | 2016-06-29 | 广西大学 | Method for rapidly analyzing concrete chloride ion diffusion coefficient based on double control lines |
| CN105928835A (en) * | 2016-04-18 | 2016-09-07 | 广西大学 | Concrete chlorine ion diffusion coefficient measuring method based on diffusion domain average concentration model |
| CN106802318A (en) * | 2017-01-09 | 2017-06-06 | 北京工业大学 | A kind of assay method of hydrated cement paste chlorion fixed amount |
| CN108088773A (en) * | 2017-12-15 | 2018-05-29 | 重庆科技学院 | A kind of method for building up of surface of low-carbon steel nickel-plate alloy diffusion model |
| CN110568165A (en) * | 2019-07-30 | 2019-12-13 | 深圳大学 | Concrete mesoscopic chloride ion diffusion coefficient prediction method |
| CN110702594A (en) * | 2019-10-09 | 2020-01-17 | 重庆交通大学 | Concrete material non-uniformity quantitative preparation method and internal corrosive ion erosion test method thereof |
| CN113125685A (en) * | 2021-04-09 | 2021-07-16 | 广东电网有限责任公司 | Fabricated concrete under action of chloride environment and design method of bonding interface of fabricated concrete |
| CN113218942A (en) * | 2021-05-10 | 2021-08-06 | 国网天津市电力公司电力科学研究院 | Method for detecting concrete sulfate erosion depth |
| CN113740244A (en) * | 2021-09-22 | 2021-12-03 | 中国水利水电第四工程局有限公司 | Testing method for forming mud skin to prevent seawater ion from corroding bridge pile foundation by utilizing modified marine mud |
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Cited By (17)
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|---|---|---|---|---|
| CN104088472B (en) * | 2014-07-10 | 2016-08-24 | 汕头市建设工程质量监督检测站 | Coastal building reinforced concrete structure detection and restorative procedure |
| CN104088472A (en) * | 2014-07-10 | 2014-10-08 | 汕头市建设工程质量监督检测站 | Method for detecting and restoring reinforced concrete structures of coastal building |
| CN104181081A (en) * | 2014-08-11 | 2014-12-03 | 东南大学 | Test method for representing influence of aggregate base material interface of cement-base material on carbonization speed |
| CN104181081B (en) * | 2014-08-11 | 2016-06-29 | 东南大学 | Characterize cement-based material to gather materials the test method that carbonization speed affects by substrate interface |
| CN105928835B (en) * | 2016-04-18 | 2018-08-24 | 广西大学 | Chloride Diffusion Coefficient in Concrete assay method based on flooding domain mean concentration model |
| CN105717000A (en) * | 2016-04-18 | 2016-06-29 | 广西大学 | Method for rapidly analyzing concrete chloride ion diffusion coefficient based on double control lines |
| CN105928835A (en) * | 2016-04-18 | 2016-09-07 | 广西大学 | Concrete chlorine ion diffusion coefficient measuring method based on diffusion domain average concentration model |
| CN105717000B (en) * | 2016-04-18 | 2018-03-16 | 广西大学 | Chloride Diffusion Coefficient in Concrete rapid analysis method based on double control line |
| CN106802318A (en) * | 2017-01-09 | 2017-06-06 | 北京工业大学 | A kind of assay method of hydrated cement paste chlorion fixed amount |
| CN108088773A (en) * | 2017-12-15 | 2018-05-29 | 重庆科技学院 | A kind of method for building up of surface of low-carbon steel nickel-plate alloy diffusion model |
| CN110568165A (en) * | 2019-07-30 | 2019-12-13 | 深圳大学 | Concrete mesoscopic chloride ion diffusion coefficient prediction method |
| CN110702594A (en) * | 2019-10-09 | 2020-01-17 | 重庆交通大学 | Concrete material non-uniformity quantitative preparation method and internal corrosive ion erosion test method thereof |
| CN113125685A (en) * | 2021-04-09 | 2021-07-16 | 广东电网有限责任公司 | Fabricated concrete under action of chloride environment and design method of bonding interface of fabricated concrete |
| CN113125685B (en) * | 2021-04-09 | 2022-03-04 | 广东电网有限责任公司 | Fabricated concrete under action of chloride environment and design method of bonding interface of fabricated concrete |
| CN113218942A (en) * | 2021-05-10 | 2021-08-06 | 国网天津市电力公司电力科学研究院 | Method for detecting concrete sulfate erosion depth |
| CN113740244A (en) * | 2021-09-22 | 2021-12-03 | 中国水利水电第四工程局有限公司 | Testing method for forming mud skin to prevent seawater ion from corroding bridge pile foundation by utilizing modified marine mud |
| CN113740244B (en) * | 2021-09-22 | 2023-12-22 | 中国水利水电第四工程局有限公司 | Testing method for sea mud modified sea water ion corrosion barrier bridge pile foundation |
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Application publication date: 20140709 |