CN110618128B - Test bar for rapidly testing concentration of chloride ions in concrete and preparation method and application thereof - Google Patents

Test bar for rapidly testing concentration of chloride ions in concrete and preparation method and application thereof Download PDF

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CN110618128B
CN110618128B CN201910976501.6A CN201910976501A CN110618128B CN 110618128 B CN110618128 B CN 110618128B CN 201910976501 A CN201910976501 A CN 201910976501A CN 110618128 B CN110618128 B CN 110618128B
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concrete
test bar
test
shell
finished product
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CN110618128A (en
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宋子健
刘浪
张英杰
蒋林华
王婉怡
徐娜
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Hohai University HHU
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/10—Lime cements or magnesium oxide cements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00991—Uses not provided for elsewhere in C04B2111/00 for testing

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Ceramic Engineering (AREA)
  • Biochemistry (AREA)
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  • Immunology (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Health & Medical Sciences (AREA)
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  • Life Sciences & Earth Sciences (AREA)
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  • Inorganic Chemistry (AREA)
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  • Structural Engineering (AREA)
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Abstract

The invention discloses a test bar for quickly testing the concentration of chloride ions in concrete and a preparation method and application thereof. And inserting the open end of the test rod into the concrete slurry to be tested for a certain time, taking out the test rod, reading the color change length of the test rod, and comparing the length data with the sample length data to obtain the chloride ion concentration in the fresh concrete. The invention can detect the chloride ion concentration in the concrete to be detected in real time, has the characteristics of convenient carrying, convenient use, quick detection, economy, high efficiency and the like, and can be simultaneously suitable for detecting the chloride ions of the concrete to be detected in different environments and different states. The application of chloride ion detection can effectively improve efficiency and reduce loss.

Description

Test bar for rapidly testing concentration of chloride ions in concrete and preparation method and application thereof
Technical Field
The invention belongs to the technical field of reinforced concrete, and particularly relates to a test bar for quickly testing the concentration of chloride ions in concrete, and a preparation method and application thereof.
Background
The problem of poor durability of concrete caused by corrosion of steel bars is a great concern in all countries of the world. At present, China is in the peak period of infrastructure construction and maintenance, and is the area with the most reinforced concrete structures in the world, so that the method has very important significance for solving the problem of reinforcement corrosion. In practical engineering, chloride ion corrosion is one of the most main causes of steel bar corrosion, and in marine environment, the problem of chloride ion corrosion is more prominent.
The existing method for detecting the content of chloride ions in hardened concrete comprises the steps of crushing, grinding, sampling and potentiometric titration of concrete; and for fresh concrete, a method of extracting filtrate and measuring the content of chloride ions in the filtrate by using an electrode method is adopted. The two methods have the defects of complicated pretreatment, broken sampling, inaccurate test result, inconvenient practical application and the like. Therefore, a simple and convenient chloride ion testing method with high feasibility is adopted in a construction site of fresh concrete, so that whether the concrete has quality problems or not is monitored, hidden dangers such as steel bar corrosion and the like caused by the content of chloride ions in the concrete are avoided, and the method has important significance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the test bar for quickly testing the concentration of the chloride ions in the concrete and the preparation method and application thereof.
The invention is realized by the following technical scheme:
a test rod for quickly testing the concentration of chloride ions in concrete comprises a rod body and a shell, wherein the rod body is wrapped in the shell, one end of the shell is used for accommodating the rod body, and the other end of the shell is provided with a strip-shaped opening; the bar body is composed of the following materials in parts by weight: 6-7 parts of diatomite, 2-3 parts of quicklime, 1-2 parts of silver chromate powder, 0.18-0.3 part of wood fiber and 0.09-0.18 part of glass fiber.
Preferably, the rod is a cylinder with a length of 60mm and a diameter of 10 mm.
Preferably, the housing is a hollow cylinder with an inner diameter of 11mm, an outer diameter of 13mm and a length of 62 mm.
Preferably, the shell is made of hard plastic, and the outer surface of the shell is provided with scale marks.
A preparation method of a test bar for quickly testing the concentration of chloride ions in concrete comprises the following steps:
step 1) weighing kieselguhr, quicklime, silver chromate powder, wood fibers and glass fibers in parts by weight, mixing the wood fibers and the glass fibers with water, dispersing the mixture by using a stirrer, adding the dispersed fibers into a mixture of the kieselguhr, the quicklime and the silver chromate, adding 20-100 parts by weight of water, and stirring for 15min by using the stirrer to obtain a flowable slurry;
step 2) injecting the slurry prepared in the step 1) into a mould, dehydrating under the pressure of 2.78MPa, holding the load for 1min, and removing the mould to obtain a semi-finished product;
step 3) pre-curing the semi-finished product prepared in the step 2) at 60 ℃ for 2 hours, and then transferring the semi-finished product into curing equipment for curing for 8 hours, wherein the curing temperature is maintained at 90-100 ℃, and the relative humidity is more than 90%;
and 4) putting the semi-finished product cured in the step 3) into an oven, drying for 6 hours at 105 ℃ to obtain a finished product, and finally filling the finished product into a shell to obtain the product.
The application of a test bar for quickly testing the concentration of chloride ions in concrete in detecting the concentration of chloride ions in concrete is as follows: respectively putting more than one rapid inspection test rods into a chloride ion solution with concentration gradient, and changing the height according to the colors of the test rods with different concentrations to serve as sample data; and then inserting the rapid inspection test bar into the concrete to be tested, taking out the test bar after the test bar acts for 1-2 min, observing the color change height on the test bar, and finally comparing the actual measurement data with the sample data to obtain the chloride ion concentration in the concrete to be tested.
The invention has the following beneficial effects:
the test bar can detect the concentration of chloride ions in the fresh concrete in real time, has the characteristics of convenience in carrying and use, rapidness in detection, economy, high efficiency and the like, and is also suitable for detecting the chloride ions of the fresh concrete in different environments and different states. The application of chloride ion detection can effectively improve efficiency and reduce loss.
Drawings
FIG. 1 is a front view of a test stick of the present invention;
FIG. 2 is a bottom schematic view of a test stick of the present invention.
In the figure: 1. a housing; 2. a rod body; 3. a strip-shaped opening; 4. a void; 5. a rigid plastic spacer.
Detailed Description
The invention is described in further detail below with reference to specific embodiments and with reference to the following drawings.
Example 1
A test bar for rapidly testing the concentration of chloride ions in concrete is shown in figure 1 and comprises a bar body 2 and a shell 1, wherein the bar body 2 is wrapped in the shell 1, one end of the shell 1 is used for accommodating the bar body 2, and the other end of the shell is provided with a strip-shaped opening 3. The test paper is used for preventing the concrete to be tested from polluting the test paper, and the rod body 2 is not easy to break when being inserted into the concrete to be tested.
The bar body 2 is composed of the following materials in parts by weight: 6-7 parts of diatomite, 2-3 parts of quicklime, 1-2 parts of silver chromate powder, 0.18-0.3 part of wood fiber and 0.09-0.18 part of glass fiber. The rod body 2 is cylindrical in shape, 60mm in length and 10mm in diameter. For absorbing the solution and testing quickly.
The shell 1 is made of transparent hard plastic, is in the shape of a hollow cylinder, has the inner diameter of 11mm, the outer diameter of 13mm and the length of 62mm, and is provided with scale marks on the outer surface, so that the reading is convenient.
As shown in fig. 2, the strip-shaped opening 3 is used for contacting the rod 2 with the concrete to be tested, and the bottom of the strip-shaped opening is formed by spacing hard plastic partition plates 5 and gaps 4.
Example 2
A preparation method of a test bar for quickly testing the concentration of chloride ions in concrete comprises the following specific steps:
(1) weighing 6 parts by weight of diatomite, 2 parts by weight of quicklime, 1 part by weight of silver chromate powder, 0.18 part by weight of wood fiber and 0.09 part by weight of glass fiber, mixing the wood fiber and the glass fiber with water, dispersing the wood fiber and the glass fiber by using a stirrer, adding the dispersed fiber into a mixture of the diatomite, the quicklime and the silver chromate, adding 20-100 parts by weight of water until the mixture has certain fluidity, and stirring for 15min by using the stirrer to obtain the flowable slurry.
(2) Injecting the slurry into a mold, dehydrating under pressure of 2.78MPa, holding the load for 1min, and removing the mold to obtain a semi-finished product.
(3) Pre-curing the semi-finished product at 60 ℃ for 2h, and then transferring the semi-finished product into curing equipment for curing for 8h, wherein the curing temperature is maintained at 90-100 ℃, and the relative humidity is more than 90%.
(4) And (3) placing the cured semi-finished product in an oven, drying for 6h at 105 ℃ to obtain a finished product, and finally filling the finished product into a shell to obtain the product.
Example 3
The detection method of the chloride ion concentration in the concrete comprises the following steps:
a plurality of test bars prepared in example 2 were placed in a chloride ion solution having a concentration gradient, and the height of the test bar was changed according to the color of the test bar at different concentrations to obtain sample data; and then inserting the test bar into the concrete to be tested, taking out the test bar after the test bar acts for 1-2 min, observing the color change height on the test bar, and finally comparing the actually measured data with the sample data to obtain the chloride ion concentration in the concrete to be tested.
The above-described embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and all alternatives, modifications, and simplifications may be made without departing from the spirit or scope of the present invention as defined by the appended claims.

Claims (4)

1. A test rod for quickly testing the concentration of chloride ions in concrete comprises a rod body and a shell, and is characterized in that the rod body is wrapped in the shell, one end of the shell is used for accommodating the rod body, and the other end of the shell is provided with a strip-shaped opening; the bar body is composed of the following materials in parts by weight: 6-7 parts of diatomite, 2-3 parts of quicklime, 1-2 parts of silver chromate powder, 0.18-0.3 part of wood fiber and 0.09-0.18 part of glass fiber;
the rod body is a cylinder, the length of the rod body is 60mm, and the diameter of the rod body is 10 mm;
the preparation method of the test bar comprises the following steps:
step 1) weighing kieselguhr, quicklime, silver chromate powder, wood fibers and glass fibers in parts by weight, mixing the wood fibers and the glass fibers with water, dispersing the mixture by using a stirrer, adding the dispersed fibers into a mixture of the kieselguhr, the quicklime and the silver chromate, adding 20-100 parts by weight of water, and stirring for 15min by using the stirrer to obtain a flowable slurry;
step 2) injecting the slurry prepared in the step 1) into a mould, dehydrating under the pressure of 2.78MPa, holding the load for 1min, and removing the mould to obtain a semi-finished product;
step 3) pre-curing the semi-finished product prepared in the step 2) at 60 ℃ for 2 hours, and then transferring the semi-finished product into curing equipment for curing for 8 hours, wherein the curing temperature is maintained at 90-100 ℃, and the relative humidity is more than 90%;
and 4) putting the semi-finished product cured in the step 3) into an oven, drying for 6 hours at 105 ℃ to obtain a finished product, and finally filling the finished product into a shell to obtain the product.
2. The test bar for rapid examination of chloride ion concentration in concrete according to claim 1, wherein the housing is a hollow cylinder with an inner diameter of 11mm, an outer diameter of 13mm and a length of 62 mm.
3. The test bar for rapidly testing the concentration of chloride ions in concrete according to claim 2, wherein the shell is made of hard plastic, and scale marks are arranged on the outer surface of the shell.
4. The use of the test bar for rapid test of chloride ion concentration in concrete according to any one of claims 1 to 3, wherein more than one test bar for rapid test is placed in a chloride ion solution with concentration gradient, and the height of the test bar is changed according to the color of the test bar under different concentrations to serve as sample data; and then inserting the rapid inspection test bar into the concrete to be tested, taking out the test bar after the test bar acts for 1-2 min, observing the color change height on the test bar, and finally comparing the actual measurement data with the sample data to obtain the chloride ion concentration in the concrete to be tested.
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CN114018909A (en) * 2021-11-08 2022-02-08 河海大学 Test bar for rapidly detecting chloride ions in sewage and preparation method and application thereof
CN114018910A (en) * 2021-11-08 2022-02-08 河海大学 Test bar for rapidly detecting chloride ions in cement paste and preparation method and application thereof

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2376627Y (en) * 1999-05-04 2000-05-03 曹现强 Indication bar for determing available chlorine
CN103645274A (en) * 2013-12-03 2014-03-19 河北钢铁股份有限公司邯郸分公司 Method for determining content of chlorine ion in cold-rolled emulsified liquid
CN104155408A (en) * 2014-07-09 2014-11-19 深圳大学 Method and test paper for quickly testing concentration of chloride ions in concrete
CN106124494A (en) * 2016-06-16 2016-11-16 浙江大学宁波理工学院 Muriatic enrichment and method for quick in water
CN106645131A (en) * 2017-01-24 2017-05-10 浙江工业大学 Test paper type portable soil moisture content measurer
JP2019074410A (en) * 2017-10-16 2019-05-16 太平洋セメント株式会社 Chloride ion concentration estimating method
CN109884043A (en) * 2019-03-14 2019-06-14 南通市建筑科学研究院有限公司 Chloride content prod and preparation method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2376627Y (en) * 1999-05-04 2000-05-03 曹现强 Indication bar for determing available chlorine
CN103645274A (en) * 2013-12-03 2014-03-19 河北钢铁股份有限公司邯郸分公司 Method for determining content of chlorine ion in cold-rolled emulsified liquid
CN104155408A (en) * 2014-07-09 2014-11-19 深圳大学 Method and test paper for quickly testing concentration of chloride ions in concrete
CN106124494A (en) * 2016-06-16 2016-11-16 浙江大学宁波理工学院 Muriatic enrichment and method for quick in water
CN106645131A (en) * 2017-01-24 2017-05-10 浙江工业大学 Test paper type portable soil moisture content measurer
JP2019074410A (en) * 2017-10-16 2019-05-16 太平洋セメント株式会社 Chloride ion concentration estimating method
CN109884043A (en) * 2019-03-14 2019-06-14 南通市建筑科学研究院有限公司 Chloride content prod and preparation method thereof

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