CN112924504B - Sensor for in-situ measurement of chloride ion concentration in concrete - Google Patents
Sensor for in-situ measurement of chloride ion concentration in concrete Download PDFInfo
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- CN112924504B CN112924504B CN202110115833.2A CN202110115833A CN112924504B CN 112924504 B CN112924504 B CN 112924504B CN 202110115833 A CN202110115833 A CN 202110115833A CN 112924504 B CN112924504 B CN 112924504B
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- 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
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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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
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/333—Ion-selective electrodes or membranes
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Abstract
The invention discloses a sensor for in-situ measurement of chloride ion concentration in concrete, which comprises a chloride ion selective electrode, wherein a measurement medium is wrapped outside the chloride ion selective electrode, a hollow protective sleeve is sleeved outside the measurement medium, the top of the sleeve is filled with a sealing layer, and a lead penetrating through the sealing layer is connected to the chloride ion selective electrode. The sensor can be buried in the early stage of a concrete building, the concrete structure is not damaged in the later stage, the chloride ion concentration in the concrete is measured in a nondestructive mode, the sensor is simple to manufacture, and the cost is low.
Description
Technical Field
The invention relates to a sensor, in particular to a sensor for in-situ measurement of chloride ion concentration in concrete.
Background
The corrosion of the steel bars caused by the invasion of chloride ions is the most main reason of the reduction of the durability of the concrete structure, and the service safety of the concrete structure is seriously threatened. The concrete environment is a high-alkaline environment, the steel bars are passivated in the high-alkaline environment, a passivation film with a compact agenda is generated on the surface, corrosion of the steel bars can be effectively inhibited, in practical application, particularly, the seawater contains chloride ions with high concentration at the seaside, the chloride ions can diffuse to the inside through capillary holes in the concrete and reach the surface of the steel bars, when the concentration of the chloride ions on the surface of the steel bars reaches a certain value, the passivation film generated on the surface of the steel bars can be damaged, the steel bars are corroded, corrosion and expansion of the steel bars cause concrete cracking, the bearing capacity of a reinforced concrete structure is reduced, and the concrete structure fails. Therefore, the measurement of the chloride ion concentration in concrete is of great significance to the accurate evaluation of the durability health condition of the reinforced concrete structure. At present, the method for measuring the concentration of chloride ions in concrete mainly adopts manual core drilling and powder taking, and then adopts a chemical titration mode in a laboratory to measure the concentration of chloride ions in concrete. The method has the advantages that on one hand, the method is destructive to the structure, and the integral durability of the concrete structure is influenced; on the other hand, a relatively large amount of manpower, material resources, and financial resources are consumed.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a sensor for in-situ measurement of the concentration of chloride ions in concrete, which can avoid damaging a concrete structure and has low detection cost.
The technical scheme is as follows: the sensor for in-situ measurement of the concentration of the chloride ions in the concrete comprises a chloride ion selective electrode, a measurement medium is wrapped outside the chloride ion selective electrode, a hollow protective sleeve is sleeved outside the measurement medium, a sealing layer is filled at the top of the sleeve, and a lead penetrating through the sealing layer is connected to the chloride ion selective electrode.
The chlorine ion selective electrode is an Ag/AgCl chlorine ion selective electrode, the sealing layer is an epoxy resin sealing layer, and the lead is a copper lead.
Wherein the measuring medium is prepared by the following steps:
(1) Taking polyester staple fiber needle-punched non-woven geotextile;
(2) Adding bentonite into water, and stirring to obtain a bentonite solution;
(3) Completely immersing the polyester staple fiber needle-punched non-woven geotextile into a bentonite solution, uniformly stirring and then standing;
(4) And after the bentonite solution is completely gelled, taking out the polyester staple fiber needle-punched non-woven geotextile, and scraping off the gel on the surface of the geotextile to obtain the measuring medium layer.
Wherein, the concentration of the bentonite in the bentonite solution in the step 2 is 0.2-0.25 g/mL.
Wherein, the measuring medium is prepared by the following steps:
(1) Taking polyester staple fiber needle-punched non-woven geotextile;
(2) Adding methyl cellulose into water, and stirring the mixture evenly to obtain a methyl cellulose solution;
(3) Completely immersing the polyester staple fiber needle-punched non-woven geotextile into a methyl cellulose solution, uniformly stirring and standing;
(4) And after the methyl cellulose solution is completely gelled, taking out the polyester staple fiber needle-punched non-woven geotextile, and scraping off the gel on the surface of the geotextile to obtain the measuring dielectric layer.
Wherein, in the step 2, the concentration of the methyl cellulose in the methyl cellulose solution is 0.2 to 0.25g/mL, the water is firstly heated to 75 to 85 ℃, and then the methyl cellulose is added.
The working principle is as follows: the invention arranges a layer of measuring medium layer on the surface of the chloride ion selective electrode, which avoids the direct contact between the chloride ion selective electrode and the concrete, and makes the measuring interface of the chloride ion selective electrode uniform and stable.
Has the beneficial effects that: compared with the prior art, the invention has the following remarkable advantages: 1. the sensor can be embedded in the early stage of concrete construction, so that the concrete structure is not damaged in the later stage, and the chloride ion concentration in the concrete can be measured without damage; 2. simple manufacture and low cost.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
fig. 2 is a schematic structural view of the hollowed-out protection sleeve.
Detailed Description
Example 1
As shown in fig. 1, the sensor for in-situ measurement of the concentration of chloride ions in concrete comprises a chloride ion selective electrode 5, the chloride ion selective electrode 5 is an Ag/AgCl chloride ion selective electrode, a measurement medium 4 is wrapped outside the chloride ion selective electrode 5, a hollow protective sleeve 3 shown in fig. 2 is sleeved outside the measurement medium 4, a sealing layer 2 is filled at the top of the sleeve 3, the sealing layer 2 is an epoxy resin sealing layer, and a copper lead 1 penetrating through the sealing layer 2 is connected to the chloride ion selective electrode 5.
The sensor was prepared as follows:
first, a measurement medium 4 is prepared: taking polyester staple fiber needle-punched non-woven geotextile; (2) Adding bentonite into water, and stirring until the bentonite is uniformly stirred to obtain a bentonite solution with the concentration of 0.2 g/mL; (3) Completely immersing the polyester staple fiber needle-punched non-woven geotextile into a bentonite solution, uniformly stirring, and standing; (4) And after the bentonite solution is completely gelled, taking out the polyester staple fiber needle-punched non-woven geotextile, and scraping off the gel on the surface of the geotextile to obtain the measuring medium layer. Then taking a hollow protective sleeve 3 with 4 hollowed surfaces, wherein the hollow protective sleeve 3 is a polytetrafluoroethylene protective sleeve, folding the prepared measuring medium 4 into a cylinder shape, placing the cylinder shape inside the hollow protective sleeve 3, tightly attaching the outer surface of the measuring medium 4 to the inner surface of the hollow protective sleeve 3, and completely and tightly butting the butt joint of the measuring medium 4 while avoiding the hollowed part of the hollow protective sleeve 3; inserting the Ag/AgCl chloride ion selective electrode along the inside of the measuring medium 4 to ensure that the Ag/AgCl chloride ion selective electrode is completely and tightly contacted with the measuring medium 4; and sealing the top opening end of the hollowed-out protective sleeve 3 by using an epoxy resin sealing layer 2, and curing the epoxy resin sealing layer 2 to obtain the sensor. When the sensor is used, the sensor is embedded into concrete when the concrete is poured, the copper lead 1 connected with the top of the Ag/AgCl chloride ion selective electrode is led out and connected to measuring equipment, and then the chloride ion concentration in the concrete can be measured.
Example 2
As shown in fig. 1, the sensor for in-situ measurement of the concentration of chloride ions in concrete comprises a chloride ion selective electrode 5, the chloride ion selective electrode 5 is an Ag/AgCl chloride ion selective electrode, a measurement medium 4 is wrapped outside the chloride ion selective electrode 5, a hollow protective sleeve 3 is wrapped outside the measurement medium 4, the top of the sleeve 3 is filled with a sealing layer 2, the sealing layer 2 is an epoxy resin sealing layer, and a copper lead 1 penetrating through the sealing layer 2 is connected to the chloride ion selective electrode 5.
The sensor was prepared as follows:
first, a measurement medium 4 is prepared: taking polyester staple fiber needle-punched non-woven geotextile; (2) Heating water to 85 ℃, adding methyl cellulose into the water, and stirring the mixture evenly to obtain a methyl cellulose solution with the concentration of 0.25g/mL; (3) Completely immersing the polyester staple fiber needle-punched non-woven geotextile into a methyl cellulose solution, uniformly stirring and then standing; (4) And after the methyl cellulose solution is completely gelled, taking out the polyester staple fiber needle-punched non-woven geotextile, and scraping off the gel on the surface of the geotextile to obtain the measuring dielectric layer. Then taking a hollow protective sleeve 3 with 4 hollowed surfaces, wherein the hollow protective sleeve 3 is a polytetrafluoroethylene protective sleeve, folding the prepared measuring medium 4 into a cylindrical shape, placing the cylindrical measuring medium in the hollow protective sleeve 3, enabling the outer surface of the measuring medium 4 to be tightly attached to the inner surface of the hollow protective sleeve 3, and enabling the butt joint of the measuring medium 4 to be completely and tightly butted and avoiding the hollowed part of the hollow protective sleeve 3; inserting the Ag/AgCl chloride ion selective electrode along the inside of the measuring medium 4 to ensure that the Ag/AgCl chloride ion selective electrode is completely and tightly contacted with the measuring medium 4; and sealing the top opening end of the hollowed-out protective sleeve 3 by using an epoxy resin sealing layer 2, and curing the epoxy resin sealing layer 2 to obtain the sensor. When the sensor is used, the sensor is embedded into concrete when the concrete is poured, the copper lead 1 connected with the top of the Ag/AgCl chloride ion selective electrode is led out and connected to measuring equipment, and then the chloride ion concentration in the concrete can be measured.
Claims (5)
1. The sensor for in-situ measurement of the concentration of chloride ions in concrete is characterized by comprising a chloride ion selective electrode (5), wherein a measurement medium (4) is wrapped outside the chloride ion selective electrode (5), a hollow protective sleeve (3) is wrapped outside the measurement medium (4), a sealing layer (2) is filled at the top of the hollow protective sleeve (3), and a lead (1) penetrating through the sealing layer (2) is connected to the chloride ion selective electrode (5); the measuring medium (4) is prepared by a first method or a second method; the first method comprises the following steps: taking polyester staple fiber needle-punched non-woven geotextile; (2) Adding bentonite into water, and stirring the mixture until the mixture is uniform to obtain a bentonite solution, wherein the concentration of the bentonite in the bentonite solution is 0.2-0.25 g/mL; (3) Completely immersing the polyester staple fiber needle-punched non-woven geotextile into a bentonite solution, uniformly stirring and then standing; (4) After the bentonite solution is completely gelled, taking out the polyester staple fiber needle-punched non-woven geotextile, and scraping off the gel on the surface of the geotextile to obtain a measuring medium layer; the second method comprises the following steps: taking polyester staple fiber needle-punched non-woven geotextile; (2) Adding methyl cellulose into water, and stirring the mixture until the mixture is uniform to obtain a methyl cellulose solution, wherein the concentration of the methyl cellulose in the methyl cellulose solution is 0.2 to 0.25g/mL; (3) Completely immersing the polyester staple fiber needle-punched non-woven geotextile into a methyl cellulose solution, uniformly stirring and standing; (4) And after the methyl cellulose solution is completely gelled, taking out the polyester staple fiber needle-punched non-woven geotextile, and scraping off the gel on the surface of the geotextile to obtain the measuring dielectric layer.
2. Sensor for in-situ measurement of chloride ion concentration in concrete according to claim 1, characterised in that the chloride ion selective electrode (5) is an Ag/AgCl chloride ion selective electrode.
3. The sensor for in-situ measurement of chloride ion concentration in concrete according to claim 1, wherein the sealing layer (2) is an epoxy sealing layer.
4. The sensor for in-situ measurement of chloride ion concentration in concrete according to claim 1, wherein the wire (1) is a copper wire.
5. The sensor according to claim 1, wherein in the second method, in the step (2), the water is heated to 75-85 ℃ and then the methylcellulose is added.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110115833.2A CN112924504B (en) | 2021-01-28 | 2021-01-28 | Sensor for in-situ measurement of chloride ion concentration in concrete |
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| CN202110115833.2A CN112924504B (en) | 2021-01-28 | 2021-01-28 | Sensor for in-situ measurement of chloride ion concentration in concrete |
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| CN112924504A CN112924504A (en) | 2021-06-08 |
| CN112924504B true CN112924504B (en) | 2022-10-14 |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2040610A1 (en) * | 1990-05-21 | 1991-11-22 | John E. Bennett | Apparatus for the removal of chloride from reinforced concrete structures |
| IT1246041B (en) * | 1990-11-16 | 1994-11-07 | Oronzio De Nora Sa | PERMANENT REFERENCE ELECTRODE FOR MEASUREMENT OF THE ELECTROCHEMICAL POTENTIAL OF METAL REINFORCEMENT IN CONCRETE. |
| JP2011011934A (en) * | 2009-06-30 | 2011-01-20 | Takenaka Komuten Co Ltd | Hydrogel sheet for concrete modification and concrete modification method using the same |
| CN101726525B (en) * | 2009-12-10 | 2012-09-05 | 哈尔滨工业大学 | Embedded-type sensor for detecting concrete chloride ion content and preparation method thereof |
| CN102401781A (en) * | 2011-09-28 | 2012-04-04 | 中交第四航务工程局有限公司 | Reference electrode for reinforced concrete and manufacturing method of reference electrode |
| CN106677174A (en) * | 2016-11-08 | 2017-05-17 | 广西大学 | Reinforced concrete pile structure capable of preventing seawater corrosion based on semi-permeable membrane |
| CN106885835B (en) * | 2017-04-01 | 2023-05-16 | 江苏科技大学 | Pre-buried reference electrode for reinforced concrete corrosion monitoring and manufacturing method |
| CN206945599U (en) * | 2017-04-01 | 2018-01-30 | 江苏科技大学 | Built-in type reference electrode is used in a kind of steel reinforced concrete erosion monitoring |
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