CN102590059A - Method for determining penetration depth of iodide ions in concrete - Google Patents
Method for determining penetration depth of iodide ions in concrete Download PDFInfo
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- CN102590059A CN102590059A CN2012100108337A CN201210010833A CN102590059A CN 102590059 A CN102590059 A CN 102590059A CN 2012100108337 A CN2012100108337 A CN 2012100108337A CN 201210010833 A CN201210010833 A CN 201210010833A CN 102590059 A CN102590059 A CN 102590059A
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Abstract
The invention discloses a method for determining the penetration depth of iodide ions in concrete, which comprises the following steps of: (101) splitting a test piece: splitting the test piece into two halves after a migration test is completed; (102) spraying a reagent: spraying a potassium iodate solution to the splitting face of concrete, and spraying a starch suspension; (103) acidifying the surface: spraying a weak acid solution when the splitting face of concrete is slightly dry after the step (102) is completed; and (104) measuring the penetration depth: measuring the penetration depth of iodide ions after the splitting face of concrete develops a color, wherein the penetration place of iodide ions displays brown. The test process of the determination method is not influenced by chloride ions inside concrete, the process is simple and quick, and durability design and life predication can be carried out on internally-doped concrete structures and structures subject to chloride ion corrosion.
Description
[technical field]
The present invention relates to unstable state electromigration test, relate in particular to the assay method of iodide ion length of penetration in the concrete.
[background technology]
The permanance of xoncrete structure depends on lewis' acid in essence with the form entering of liquid or gas or the process of passing material, and structural life-time depends on that these materials get into concrete speed.
The harmfulness medium is invaded the influence that concrete process mainly receives concrete permeability." perviousness " this speech is widely used, and under general situation, being meant influences the characteristic that medium is invaded.
The mensuration of chloride diffusion coefficient has crucial influence for the prediction rate of propagation.The most frequently used method still is unstable state electromigration test (RCM) at present, through measuring the mean value (T) of anolyte initial sum finishing temperature, test specimen height (h), chlorion diffusion depth (x
d) be energizing test time (t), calculate the chlorion rapid diffusion coefficient of concrete sample, expression formula is following:
This test method is axially applying external potential for striding across sample, forces the chlorion of negative pole in sample, to move., after the regular hour, sample is rived vertically in test, on the test specimen surface of riving, spray 0.1mol/L AgNO3 solution immediately, can after about 15 minutes, observe white AgCl deposition.If at the test specimen surface spraying colored indicator of riving, the dried slightly back spray in surface 0.1mol/L AgNO3 solution.About about one day of the test specimen of spray AgNO3 solution, the part of chloride ion-containing will become pansy.Measure the distance of colour developing separatrix far from the bottom surface, the degree of depth that will develop the color substitution computing formula promptly obtains the concrete chloride ion coefficient of diffusion.
This method test cycle is short, test apparatus is simple, easy to operate; And directly derive coefficient of diffusion according to the measured value of the chlorion intrusion concrete degree of depth; Rather than through electric weight, resistance or the electric mensuration of leading; Advantage is more, and in the world by extensive employing, " the concrete structure durability design and construction guide " of China also recommended to use.
But RCM testing requirements inside concrete is chloride ion-containing not.If inside concrete has contained chlorion at the beginning of test, in the process of the test of RCM, inner chlorion will produce two kinds of effects: 1. they can move under electric field environment; 2. they are also and indicator reaction.These two kinds of effects can have influence on the RCM accuracy of experimental results; When interior chloride ion-containing exceeds a threshold value; The experimental technique of employing RCM can not be measured the chloride diffusion coefficient of structure; Therefore, present test method can not solve following two kinds of situation: one, the mensuration of internal doping type chlorion xoncrete structure infiltration coefficient; Two, received the mensuration of chlorion corrosion concrete structure infiltration coefficient.
For the concrete that inside has been contained chlorion carries out reliable RCM test; To obtain result accurately; Can consider to measure with the iodide ion coefficient of diffusion replaces chloride diffusion coefficient to measure; Measure but concrete is carried out the iodide ion coefficient of diffusion, need set up the standard test method of iodide ion colour developing.
[summary of the invention]
The technical matters that the present invention will solve provides a kind of in unstable state electromigration process of the test, can the fast measuring concrete in the method for iodide ion length of penetration.
In order to solve the problems of the technologies described above, the technical scheme that the present invention adopts is that the assay method of iodide ion length of penetration in a kind of concrete may further comprise the steps:
101) splitting test specimen: after test specimen is finished the electromigration test, cleave in two;
102) spray reagent: on concrete splitting surface, spray iodate solution, spray starch suspension again;
103) acidifying surface: after step 102 is accomplished, when concrete splitting surface surface is dried slightly, spray weak acid solution;
104) measure length of penetration: after treating concrete splitting surface colour developing, measure the iodide ion length of penetration.
The assay method of iodide ion length of penetration in the above-described concrete, the Potassiumiodate that described iodate solution is mass percent concentration 1%-4% or the sodium iodate WS.
The assay method of iodide ion length of penetration in the above-described concrete, said starch suspension are mass percent concentration 2%-5% starch water slurries.
The assay method of iodide ion length of penetration in the above-described concrete, described weak acid solution are the aqueous acetic acids of mass percent concentration 30%-50%.
The assay method of iodide ion length of penetration in the above-described concrete, step 102 was accomplished after 10 minutes, and 103 spray weak acid solution set by step.
The process of the test of the assay method of iodide ion length of penetration does not receive the influence of inside concrete chlorion in the concrete of the present invention, and process is simply quick, can be used for the internal doping type xoncrete structure and has received the chlorion eating texture to carry out durability Design and life prediction.
[embodiment]
Through embodiment the present invention is further set forth below:
In the reagent that the present invention uses, iodate can be Potassiumiodate or sodium iodate so long as there is the compound of iodate to get final product; Weak acid can be can be acetic acid or phosphoric acid.
Use following agent prescription in the embodiment of the invention:
The Potassiumiodate 1%-4% WS (Potassiumiodate is a chemical pure, adopts Xilong Chemical Co., Ltd's product);
The suspending liquid of starch 2%-5% water (starch is Huankai Microbes Tech Co., Ltd., Guangdong's product);
The acetic acid 30%-50% WS (acetic acid is chemical pure, adopts Shanghai Ling Feng chemical reagent company limited product).
The suspending liquid of the above Potassiumiodate 1%-4% WS, starch 2%-5% water and the acetic acid 30%-50% WS concentration are by mass percentage weighed raw material, mix, stir and can obtain the reagent of needs.
Embodiment 1:
I, splitting test specimen: after test specimen is finished electromigration test, after removing from rubber tube, cleave in two on pressure testing machine immediately;
II, sprinkling reagent: the potassium iodate solution of injection 1% is oxidized to iodine to the iodide ion in the concrete earlier, sprays 2% starch suspension again;
III, acidifying surface: dried slightly back, surface (about 15 minutes), spray 30% acetum;
IV, measurement length of penetration: the place that iodide ion is penetrated into shows brown, treats concrete surface colour developing back measurement iodide ion length of penetration.
Embodiment 2:
I, splitting test specimen: after test specimen is finished electromigration test, after removing from rubber tube, cleave in two on pressure testing machine immediately;
II, sprinkling reagent: the potassium iodate solution of injection 2% is oxidized to iodine to the iodide ion in the concrete earlier, sprays 2% starch suspension again;
III, acidifying surface: dried slightly back, surface (about 15 minutes), spray 30% acetum;
IV, measurement length of penetration: the place that iodide ion is penetrated into shows brown, treats concrete surface colour developing back measurement iodide ion length of penetration.
Embodiment 3:
I, splitting test specimen: after test specimen is finished electromigration test, after removing from rubber tube, cleave in two on pressure testing machine immediately;
II, sprinkling reagent: the potassium iodate solution of injection 3% is oxidized to iodine to the iodide ion in the concrete earlier, sprays 2% starch suspension again;
III, acidifying surface: dried slightly back, surface (about 15 minutes), spray 30% acetum;
IV, measurement length of penetration: the place that iodide ion is penetrated into shows brown, treats concrete surface colour developing back measurement iodide ion length of penetration.
Embodiment 4:
I, splitting test specimen: after test specimen is finished electromigration test, after removing from rubber tube, cleave in two on pressure testing machine immediately;
II, sprinkling reagent: the potassium iodate solution of injection 4% is oxidized to iodine to the iodide ion in the concrete earlier, sprays 2% starch suspension again;
III, acidifying surface: dried slightly back, surface (about 15 minutes), spray 30% acetum;
IV, measurement length of penetration: the place that iodide ion is penetrated into shows brown, treats concrete surface colour developing back measurement iodide ion length of penetration.
Embodiment 5:
I, splitting test specimen: after test specimen is finished electromigration test, after removing from rubber tube, cleave in two on pressure testing machine immediately;
II, sprinkling reagent: the potassium iodate solution of injection 1% is oxidized to iodine to the iodide ion in the concrete earlier, sprays 5% starch suspension again;
III, acidifying surface: dried slightly back, surface (about 15 minutes), spray 30% acetum;
IV, measurement length of penetration: the place that iodide ion is penetrated into shows brown, treats concrete surface colour developing back measurement iodide ion length of penetration.
Embodiment 6:
I, splitting test specimen: after test specimen is finished electromigration test, after removing from rubber tube, cleave in two on pressure testing machine immediately;
II, sprinkling reagent: the potassium iodate solution of injection 1% is oxidized to iodine to the iodide ion in the concrete earlier, sprays 2% starch suspension again;
III, acidifying surface: dried slightly back, surface (about 15 minutes), spray 50% acetum;
IV, measurement length of penetration: the place that iodide ion is penetrated into shows brown, treats concrete surface colour developing back measurement iodide ion length of penetration.
Principle of the present invention is to utilize iodine to meet starch coloration.Its cardinal principle is to utilize the high price iodide ion to be oxidized to iodine molecule to the negative monovalence iodide ion in the concrete; And amylose is to form spiral helicine long conveyor screw by the condensation of phlorose molecule; Each glucose unit all still has hydroxyl to be exposed to outside the spiral, and iodine molecule makes iodine molecule embed the spirochetal axis part of starch with these hydroxyl effects; Generate the inclusion compound of colour developing; In certain degree of polymerization or relative molecular mass scope, with the increase of the degree of polymerization or relative molecular mass, the change in color of inclusion compound by colourless, orange, light red, purple to blue.Starch is the most stable when pH=4 with the inclusion compound that iodine generates, and inside concrete is an alkaline environment, and therefore the pH value will spray acetum at concrete surface generally more than 12.The present invention utilizes under the sour environment just, and iodine is met the principle of starch coloration, sets up the recognition technology of iodide ion in concrete.
Measuring the present the most frequently used method of concrete infiltration coefficient is unstable state electromigration test (RCM); But chlorion has been contained in if structure inside; These chlorions will influence accuracy of experimental results, when content is too much even can't measure the chloride diffusion coefficient of structure.The present invention sets up the recognition technology of iodide ion in concrete; In the process of the test; Do not receive the influence of inside concrete chlorion, to the internal doping type xoncrete structure with when having received the chlorion eating texture to carry out durability Design and life prediction, the present invention has important practical significance and learning value.
Claims (5)
1. the assay method of iodide ion length of penetration in the concrete is characterized in that, may further comprise the steps:
101) splitting test specimen: after test specimen is finished the electromigration test, cleave in two;
102) spray reagent: on concrete splitting surface, spray iodate solution, spray starch suspension again;
103) acidifying surface: after step 102 is accomplished, when concrete splitting surface surface is dried slightly, spray weak acid solution;
104) measure length of penetration: after treating concrete splitting surface colour developing, measure the iodide ion length of penetration.
2. the assay method of iodide ion length of penetration is characterized in that in the concrete according to claim 1, the Potassiumiodate that described iodate solution is mass percent concentration 1%-4% or the sodium iodate WS.
3. the assay method of iodide ion length of penetration is characterized in that in the concrete according to claim 1, and said starch suspension is a mass percent concentration 2%-5% starch water slurry.
4. the assay method of iodide ion length of penetration is characterized in that in the concrete according to claim 1, and described weak acid solution is the aqueous acetic acid of mass percent concentration 30%-50%.
5. the assay method of iodide ion length of penetration is characterized in that in the concrete according to claim 1, and step 102 was accomplished after 10 minutes, and 103 spray weak acid solution set by step.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278429A (en) * | 2013-05-13 | 2013-09-04 | 深圳大学 | Method for indirectly measuring concrete chloride ion diffusion coefficient |
| CN103630533A (en) * | 2013-11-13 | 2014-03-12 | 南京工业大学 | Free SO on concrete surface42-Method for detecting ion erosion depth |
| CN105403486A (en) * | 2015-11-09 | 2016-03-16 | 深圳大学 | RIM testing device and RIM testing method |
| CN107907463A (en) * | 2017-11-07 | 2018-04-13 | 河海大学 | The assay method of chromate ion penetration depth in a kind of cement-based material |
| CN109540766A (en) * | 2019-01-14 | 2019-03-29 | 江西省水利科学研究院 | A kind of test method of concrete core sample relative permeability |
| CN111077055A (en) * | 2019-12-25 | 2020-04-28 | 四川中核艾瑞特工程检测有限公司 | Chloride ion penetration depth measuring method |
| CN112858268A (en) * | 2020-09-18 | 2021-05-28 | 武汉大学 | Soil water and solute migration university measuring method based on chemical imaging-correction analysis |
| CN115452660A (en) * | 2022-08-19 | 2022-12-09 | 中建材创新科技研究院有限公司 | Method for measuring penetration depth of liquid in gypsum board |
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| CN101285821A (en) * | 2008-05-22 | 2008-10-15 | 武汉理工大学 | Method for distinguishing and determining concrete inside chemically binding or physical adsorption chloride ion |
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2012
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101285821A (en) * | 2008-05-22 | 2008-10-15 | 武汉理工大学 | Method for distinguishing and determining concrete inside chemically binding or physical adsorption chloride ion |
Non-Patent Citations (4)
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| 《cement and concrete research》 20041231 S.Lay等 "new method to measure the rapid chloride migration coefficient of chloride-contaminated concrete" 第421-427页 1-5 第34卷, * |
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| S.LAY等: ""new method to measure the rapid chloride migration coefficient of chloride-contaminated concrete"", 《CEMENT AND CONCRETE RESEARCH》, vol. 34, 31 December 2004 (2004-12-31), pages 421 - 427 * |
| 刘军等: ""盐雾环境下氯离子在混凝土中的扩散"", 《深圳大学学报理工版》, vol. 27, no. 2, 30 April 2010 (2010-04-30), pages 192 - 198 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278429A (en) * | 2013-05-13 | 2013-09-04 | 深圳大学 | Method for indirectly measuring concrete chloride ion diffusion coefficient |
| CN103630533A (en) * | 2013-11-13 | 2014-03-12 | 南京工业大学 | Free SO on concrete surface42-Method for detecting ion erosion depth |
| CN103630533B (en) * | 2013-11-13 | 2016-08-17 | 南京工业大学 | Method for detecting erosion depth of free SO 42-ions on concrete surface |
| CN105403486A (en) * | 2015-11-09 | 2016-03-16 | 深圳大学 | RIM testing device and RIM testing method |
| CN107907463A (en) * | 2017-11-07 | 2018-04-13 | 河海大学 | The assay method of chromate ion penetration depth in a kind of cement-based material |
| CN109540766A (en) * | 2019-01-14 | 2019-03-29 | 江西省水利科学研究院 | A kind of test method of concrete core sample relative permeability |
| CN111077055A (en) * | 2019-12-25 | 2020-04-28 | 四川中核艾瑞特工程检测有限公司 | Chloride ion penetration depth measuring method |
| CN112858268A (en) * | 2020-09-18 | 2021-05-28 | 武汉大学 | Soil water and solute migration university measuring method based on chemical imaging-correction analysis |
| CN115452660A (en) * | 2022-08-19 | 2022-12-09 | 中建材创新科技研究院有限公司 | Method for measuring penetration depth of liquid in gypsum board |
| WO2024036863A1 (en) * | 2022-08-19 | 2024-02-22 | 中建材创新科技研究院有限公司 | Method for measuring penetration depth of liquid in gypsum board |
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Application publication date: 20120718 |