CN103926305A - Instrument and method for measuring water-soluble chlorine content of concrete - Google Patents
Instrument and method for measuring water-soluble chlorine content of concrete Download PDFInfo
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- CN103926305A CN103926305A CN201310007935.8A CN201310007935A CN103926305A CN 103926305 A CN103926305 A CN 103926305A CN 201310007935 A CN201310007935 A CN 201310007935A CN 103926305 A CN103926305 A CN 103926305A
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- concrete
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910052801 chlorine Inorganic materials 0.000 title abstract description 5
- 239000000460 chlorine Substances 0.000 title abstract description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 title abstract description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 49
- 238000004364 calculation method Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 32
- 241000370738 Chlorion Species 0.000 claims description 23
- 239000000243 solution Substances 0.000 claims description 17
- 238000003556 assay Methods 0.000 claims description 15
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 14
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical group [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 9
- 239000007791 liquid phase Substances 0.000 claims description 9
- 239000012086 standard solution Substances 0.000 claims description 8
- 235000010333 potassium nitrate Nutrition 0.000 claims description 7
- 239000004323 potassium nitrate Substances 0.000 claims description 7
- 235000010344 sodium nitrate Nutrition 0.000 claims description 7
- 239000004317 sodium nitrate Substances 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000012417 linear regression Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 239000012153 distilled water Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- CRWJEUDFKNYSBX-UHFFFAOYSA-N sodium;hypobromite Chemical compound [Na+].Br[O-] CRWJEUDFKNYSBX-UHFFFAOYSA-N 0.000 claims description 2
- 238000012956 testing procedure Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 9
- 239000004576 sand Substances 0.000 abstract description 6
- 239000000523 sample Substances 0.000 description 7
- 150000002500 ions Chemical class 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- -1 chlorine ions Chemical class 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Landscapes
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses an instrument and a method for detecting water-soluble chlorine content of concrete. The instrument includes a measuring host and a sensor. The measuring host is connected to the sensor through a wire. The measuring host includes a shell, a main control board card, a chip, a display screen and a keyboard. The main control board card is installed in the shell. The display screen is installed on a surface of the shell. The keyboard is installed beside the display screen. The chip is arranged on the main control board card. The sensor is composed of a chloride ion combines with electrode bar, or is composed of a chloride ion electrode bar and a reference electrode bar. The instrument is easy to operate, is safe, is accurate in calculation and can effectively reduce errors generated from a two-point calibrating process. A measuring electric potential not drifts when chloride ion content in a mixture of sea sand and concrete is very little.
Description
Technical field
Patent of the present invention relates to a kind of instrument and method of concrete chloride content determination.Relate in particular to a kind of instrument that detects water-soluble inorganic chlorinity in concrete and part starting material thereof.
Background technology
Current: in existing detection concrete and part starting material thereof, water-soluble inorganic chlorion is to adopt ion selective electrode method (ISE), ion selective electrode method (ISE) is the technology that the seventies grows up, its ultimate principle is, between the ion meeting in electrolyte solution and solution, produce potential difference (PD), this potential difference (PD) is current potential or the electrode potential of this ion in this solution, the logarithm of the activity of its current potential to ion given in solution is linear, meets Nernst equation.Ion selective electrode method (ISE) is measured the experimental technique that chloride ion content is the chloride ion content in China's " marine traffic engineering concrete test code " a kind of Quick Measuring Dinghai sand, the concrete mix that (JTJ270-98) require.The ultimate principle of this experimental technique is: the linear relationship that in the liquid phase electrode potential E that utilization records and liquid phase, the logarithm of chlorine ion concentration C is, i.e. and E=K-0.059lgC, thus extrapolate chlorine ion concentration in liquid phase according to the electrode potential value recording.
Although provide simple formula in test specification, but test only adopts the standard solution of two kinds of variable concentrations to demarcate, although can determine a simple linear relationship, but detect through researchist, the real Nernst equation of the linear relationship calculating and Chlorine in Solution ionic reaction has certain gap, because chloride ion content in extra large sand, concrete mix is few, although be that small gap also can cause larger error.In addition, experimental implementation is comparatively loaded down with trivial details, and result needs manual calculations.In addition, few chloride ion content also causes electromotive force in detecting to drift about, and in concrete mix, composition is comparatively complicated, also can cause the drift of sense potential.
Patent of invention content
For overcoming above-mentioned defect, the purpose of design of patent of the present invention is, be to provide a kind of instrument and method of concrete water dissolubility chloride content determination, can be used for detecting the content of the inorganic chlorine ions such as aggregate, concrete mixing water such as fresh concrete, hard concrete, sandstone.
For achieving the above object, instrument and the method for a kind of concrete soluble chloride assay of patent of the present invention; It comprises Test Host and sensor, and described Test Host is connected with described sensor by wire; Described Test Host comprises shell, master control board card, chip, display screen, keyboard, and described housings is equipped with master control board card, and display screen is installed on the surface of described shell, and keyboard is installed on described display side, on described master control board card, chip is set; Described sensor is made up of chlorion combination electrode rod or chlorine ion electrode is excellent and contrast electrode rod forms.Adopt that such device is simple to operate, safety, calculating precisely, can effectively reduce the error of 2 demarcation, in the time that the chloride ion content in extra large sand, concrete mix is few, sense potential can not be drifted about.
Further, a kind of instrument of concrete soluble chloride assay in patent of the present invention and the array mode of method have two kinds: one is hand-held, and another kind is desk-top.
Further, hand-held in patent of the present invention is divided into two kinds of structures: structure one is that described Test Host connects the sensor being made up of chlorion combination electrode rod by wire, and structure two is that described Test Host connects the sensor being made up of chlorine ion electrode rod and contrast electrode rod by wire.
Further, desk-top in patent of the present invention is divided into two kinds of structures: structure three is that described Test Host connects sensor be made up of chlorion combination electrode rod by wire, and structure four is that described Test Host connects and the contrast electrode excellent sensor that form excellent by chlorine ion electrode by wire.
Further, described housings is equipped with master control board card, and display screen is installed on the surface of described shell, and keyboard is installed on described display screen side, between described master control board card and described display screen, chip is set.
Further, described chip has the function of collection, control, calculating, storage, be high impedance, have can detect millivolt function and can real-time simulation and the fast processing function of tracking.
Further, described master control board card comprises the interface being connected with display screen, the interface being connected with keyboard, circuit, the interface, the interface being connected with communication apparatus (as computer) and the interface being connected with sensor that are connected with printer.
Further, the described interface being connected with display screen connects by wire harness and display screen, the described interface being connected with keyboard connects by wire harness and keyboard, described circuit is directly to deploy to ensure effective monitoring and control of illegal activities on described master control board card, the described interface being connected with printer connects by wire harness and printer, the described interface being connected with communication apparatus (as computer) is by serial ports or USB interface and communication apparatus connection, and the described interface being connected with sensor connects by wire and sensor.
Further, described display screen is the result carrier for showing test.
Further, relatively large Test Host can be furnished with the external power interface being connected with supply voltage modular converter, can directly be connected with AC power, can directly connect embedded printer, and the main frame of small design can be furnished with battery.
Further, backlight, switch is set above described keyboard, determines, cancels, upwards, downwards, left, to the right with ten key button.Can input data by the button on described keyboard, auxiliary calculating.
Further, assisted solution using patent of the present invention: comprise two kinds of anti-interference agents, the first anti-interference agent is sodium nitrate or the potassium nitrate of 5mol/L, according to the adding proportion of 2mL in every 100mL volumetric solution or sample, while can be used for detecting, stablize the chlorion electromotive force of volumetric solution and sample solution; The second anti-interference agent is a kind of compound oxidizing solution, can be used for offsetting the interference of halogen, sulfide and prussiate (mainly coming from concrete admixture), its compound method is: in volume 1000 ml beakers, add approximately 800 ml distilled waters, add 15.1 grams of NaBrO
3in beaker, carefully slowly add 75 milliliters of red fuming nitric acid (RFNA)s (70%w/w or 15.9N), be carefully uniformly mixed, after cooling, move liquid to the volumetric flask of 1000ml scale, be filled into scale with distilled water.Cover bottle cap, put upside down volumetric flask several times, make it to mix.
The test principle that further patent of the present invention relates to is: according to Nernst equation, the linear relationship that in the liquid phase electrode potential E recording and liquid phase, the logarithm of chlorine ion concentration C is, can abbreviation be E=A+BlgC (wherein E is current potential, and C is chlorine ion concentration).Demarcate with the standard solution that is more than or equal to three kinds of variable concentrations, utilize linear regression method to determine the current potential-chlorine ion concentration relation curve (hereinafter to be referred as E-C relation curve) under current environment, detect the chlorion current potential in testing sample, calculate chlorine ion concentration in liquid phase by E-C relation curve.
Further, the chlorion detection method designing in patent of the present invention is as follows:
The first step: preparation is more than or equal to the chlorion standard solution of three kinds of variable concentrations respectively, wherein must have a kind of in 0.0001mol/L concentration left and right.In chlorion standard solution, add respectively sodium nitrate or the potassium nitrate solution of 5mol/L according to the ratio of 100mL interpolation 2mL, for the electromotive force of stabilized chlorine ion.
Second step: according to different examination criteria requirements, preparation testing sample.In sample, add sodium nitrate or the potassium nitrate solution of the ratio interpolation 5mol/L of 2mL according to 100mL, for the electromotive force of stabilized chlorine ion.Add the ratio of 2mL according to 100mL and add combined oxidation solution, for mitigate interference.
The 3rd step: according to the instructions requirement of Different electrodes, make chlorine ion electrode and supporting contrast electrode or chlorion combination electrode reach normal duty.Electrode is connected with detection main frame.
The 4th step: chlorine ion electrode and supporting contrast electrode or chlorion combination electrode order (normally according to ascending order) are inserted in the chlorion standard solution of variable concentrations, reach after the response time of electrode requirement, the current potential millivolt value of utilizing host record to collect, carry out linear regression calculating in conjunction with concentration, thereby determine E-C relation curve, calculate linear regression coeffficient r simultaneously, conventionally r at least needs to reach more than 0.995, guarantee E-C relation curve meets the requirements, r, more close to 1, represents that E-C relation curve is determined more reasonable.
The 5th step: chlorine ion electrode and supporting contrast electrode or chlorion combination electrode are inserted in testing sample, reach after the response time of electrode requirement, the current potential millivolt value of utilizing host record to collect, utilizes the computing chip of main frame according to E-C relation curve and the sample potential calculation sample concentration collecting.After being completed, result of calculation can deposit in Test Host.
Further experiment process general introduction:
(1). patent of the present invention adopts the accuracy of two kinds of methods guarantee E-C relation curves, and the firstth, multi-point calibration, the secondth, linear regression method is determined.
(2). the Test Host of patent of the present invention can be realized the function of Real-time Collection, data storage and the automatic analysis calculating of voltage data, directly calculates the chloride ion content in tested liquid phase by central processing unit, reduces Data Post workload.
(3). the electromotive force that patent of the present invention adopts the method for adding sodium nitrate or potassium nitrate that electrode is collected is stable, even in the few environment of the chloride ion contents such as extra large sand, concrete mix, also can obtain stable data.
(4). in order to solve in concrete mix, additive is for the interference of electrode detection, and patent of the present invention has configured combined oxidation solution, thereby removes the disturbing factor in chlorion measurement.
Adopt said structure and method is simple to operate, safety, calculating precisely, can effectively reduce the error of 2 demarcation, in the time that the chloride ion content in extra large sand, concrete mix is few, sense potential can not be drifted about, feature easy to use.Can detect fast the content of the inorganic chlorine ions such as aggregate, concrete mixing water such as fresh concrete, hard concrete, sandstone.
Brief description of the drawings
Fig. 1 is handheld structure one schematic diagram of patent of invention
Fig. 2 is handheld structure two schematic diagram of patent of invention
Fig. 3 is mesa structure three schematic diagram of patent of invention
Fig. 4 is mesa structure four schematic diagram of patent of invention
Embodiment
Below in conjunction with accompanying drawing, patent of the present invention is described in detail.
As shown in Figure 1,2,3, 4, instrument and the method for a kind of concrete soluble chloride assay of patent of the present invention; It comprises Test Host 1 and sensor 2, and Test Host 1 is connected with sensor 2 by wire 3; Test Host 1 comprises shell 4, master control board card (not shown), chip (not shown), display screen 5, keyboard 6, master control board card (not shown) is equipped with in shell 4 the insides, display screen 5 is installed on the surface of shell 4, on display screen 5 sides, keyboard 6 is installed, between master control board card (not shown) and display screen 5, chip (not shown) is set.Sensor 2 is made up of chlorion combination electrode rod 7 or chlorine ion electrode rod 8 and contrast electrode rod 9 form.
Master control board card (not shown) comprises the interface (not shown) being connected with display screen, the interface (not shown) being connected with keyboard, circuit (not shown), the interface (not shown), the interface 10 being connected with communication apparatus (as computer) and the interface 11 being connected with sensor that are connected with printer.
Below be only that given with reference to the accompanying drawings embodiment makes specific descriptions; it is not the restriction of patent of the present invention being made to its form; concerning the technical scheme of this area, the amendment of making in the disclosed content basis of patent of the present invention, still belongs to the protection domain of patented technology scheme of the present invention.
Claims (10)
1. instrument and the method for a concrete soluble chloride assay; It comprises Test Host and sensor, described Test Host is connected with described sensor by wire, described Test Host comprises shell, master control board card, chip, display screen, keyboard, described housings is equipped with master control board card, display screen is installed on the surface of described shell, keyboard is installed on described display screen side, on described master control board card, chip is set; Described sensor is made up of chlorion combination electrode rod or chlorine ion electrode is excellent and contrast electrode rod forms.
2. instrument and the method for a kind of concrete soluble chloride assay according to claim 1, it is characterized in that comprising two kinds of anti-interference agents, the first anti-interference agent is sodium nitrate or the potassium nitrate of 5mol/L, according to the adding proportion of 2mL in every 100mL volumetric solution or sample; The second anti-interference agent is a kind of compound oxidizing solution, and its compound method is: in volume 1000 ml beakers, add approximately 800 ml distilled waters, add 15.1 grams of NaBrO
3in beaker, carefully slowly add 75 milliliters of red fuming nitric acid (RFNA)s (70%w/w or 15.9N), be carefully uniformly mixed, after cooling, move liquid to the volumetric flask of 1000ml scale, be filled into scale with distilled water.Cover bottle cap, put upside down volumetric flask several times, make it to mix, when interpolation according to the adding proportion of 2mL in every 100mL sample.
3. instrument and the method for a kind of concrete soluble chloride assay according to claim 1, it is characterized in that test principle is: according to Nernst equation, the linear relationship that in the liquid phase electrode potential E recording and liquid phase, the logarithm of chlorine ion concentration C is, can abbreviation be E=A+BlgC (wherein E is current potential, and C is chlorine ion concentration).
4. instrument and the method for a kind of concrete soluble chloride assay according to claim 1, it is characterized in that testing procedure is: the first step, preparation is more than or equal to the chlorion standard solution of three kinds of variable concentrations respectively, wherein must there is one in 0.0001mol/L concentration left and right, in chlorion standard solution, add respectively sodium nitrate or the potassium nitrate solution of 5mol/L according to the ratio of 100mL interpolation 2mL; Second step, according to different examination criteria requirements, preparation testing sample according to sodium nitrate or the potassium nitrate solution of the ratio interpolation 5mol/L of 100mL interpolation 2mL, adds the ratio of 2mL and adds combined oxidation solution in sample according to 100mL; The 3rd step, is connected electrode with detection main frame; The 4th step: chlorine ion electrode and supporting contrast electrode or chlorion combination electrode order are inserted in the chlorion standard solution of variable concentrations, reach after the response time of electrode requirement, the current potential millivolt value of utilizing host record to collect, carry out linear regression calculating in conjunction with concentration, thereby determine E-C relation curve, calculate linear regression coeffficient r simultaneously, conventionally r at least needs to reach more than 0.995, guarantee E-C relation curve meets the requirements, r, more close to 1, represents that E-C relation curve is determined more reasonable; The 5th step, chlorine ion electrode and supporting contrast electrode or chlorion combination electrode are inserted in testing sample, reach after the response time of electrode requirement, the current potential millivolt value of utilizing host record to collect, utilize the computing chip of main frame according to E-C relation curve and the sample potential calculation sample concentration collecting, after being completed, result of calculation can deposit in Test Host.
5. instrument and the method for a kind of concrete soluble chloride assay according to claim 1, is characterized in that a kind of array mode of instrument of concrete soluble chloride assay has two kinds: one is hand-held, and another kind is desk-top.
6. instrument and the method for a kind of concrete soluble chloride assay according to claim 5, it is characterized in that hand-held is divided into two kinds of structures: structure one is that described Test Host connects the sensor being made up of chlorion combination electrode rod by wire, structure two is that described Test Host connects the sensor being made up of chlorine ion electrode rod and contrast electrode rod by wire.
7. instrument and the method for a kind of concrete soluble chloride assay according to claim 5, it is characterized in that the desk-top two kinds of structures that are divided into: structure three is that described Test Host connects the sensor being made up of chlorion combination electrode rod by wire, structure four is that described Test Host connects the sensor being made up of chlorine ion electrode rod and contrast electrode rod by wire.
8. instrument and the method for a kind of concrete soluble chloride assay according to claim 1, it is characterized in that described master control board card comprises the interface being connected with display screen, the interface being connected with keyboard, circuit, the interface, the interface being connected with communication apparatus and the interface being connected with sensor that are connected with printer.
9. instrument and the method for a kind of concrete soluble chloride assay according to claim 1, it is characterized in that the described interface being connected with display screen connects by wire harness and display screen, the described interface being connected with keyboard connects by wire harness and keyboard, described circuit is directly to deploy to ensure effective monitoring and control of illegal activities on described master control board card, the described interface being connected with printer connects by wire harness and printer, the described interface being connected with communication apparatus connects by serial ports and communication apparatus, the described interface being connected with communication apparatus connects by USB interface and communication apparatus, the described interface being connected with sensor connects by wire and sensor.
10. instrument and the method for a kind of concrete Water soluble chloride ion assay according to claim 11, it is characterized in that arranging above described keyboard backlight, switch, determine, cancel, upwards, downwards, left, to the right with ten key button.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310007935.8A CN103926305A (en) | 2013-01-10 | 2013-01-10 | Instrument and method for measuring water-soluble chlorine content of concrete |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310007935.8A CN103926305A (en) | 2013-01-10 | 2013-01-10 | Instrument and method for measuring water-soluble chlorine content of concrete |
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| CN103926305A true CN103926305A (en) | 2014-07-16 |
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| CN201310007935.8A Pending CN103926305A (en) | 2013-01-10 | 2013-01-10 | Instrument and method for measuring water-soluble chlorine content of concrete |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104634856A (en) * | 2015-02-04 | 2015-05-20 | 中国建材检验认证集团股份有限公司 | Method for detecting content of chlorine ions in sea sand |
| CN106770472A (en) * | 2017-02-24 | 2017-05-31 | 广东省建筑材料研究院 | A kind of concrete parameter detecting probe |
| CN107870184A (en) * | 2017-10-31 | 2018-04-03 | 长沙理工大学 | Device and method for monitoring concentration of chloride ions in concrete and manufacturing method of piezoelectric ceramic sensor |
| CN108828013A (en) * | 2018-05-03 | 2018-11-16 | 徐州中联混凝土有限公司 | A kind of rapid identification method of sea sand |
| CN113155931A (en) * | 2021-04-09 | 2021-07-23 | 国家烟草质量监督检验中心 | Method for detecting chloride ions in tobacco and tobacco planting soil |
| CN115015358A (en) * | 2022-04-20 | 2022-09-06 | 中冶检测认证有限公司 | Concrete chloride ion content detector and detection end point judgment method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104634856A (en) * | 2015-02-04 | 2015-05-20 | 中国建材检验认证集团股份有限公司 | Method for detecting content of chlorine ions in sea sand |
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| CN106770472A (en) * | 2017-02-24 | 2017-05-31 | 广东省建筑材料研究院 | A kind of concrete parameter detecting probe |
| CN107870184A (en) * | 2017-10-31 | 2018-04-03 | 长沙理工大学 | Device and method for monitoring concentration of chloride ions in concrete and manufacturing method of piezoelectric ceramic sensor |
| CN108828013A (en) * | 2018-05-03 | 2018-11-16 | 徐州中联混凝土有限公司 | A kind of rapid identification method of sea sand |
| CN113155931A (en) * | 2021-04-09 | 2021-07-23 | 国家烟草质量监督检验中心 | Method for detecting chloride ions in tobacco and tobacco planting soil |
| CN115015358A (en) * | 2022-04-20 | 2022-09-06 | 中冶检测认证有限公司 | Concrete chloride ion content detector and detection end point judgment method |
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Application publication date: 20140716 |