CN114264589A - Concrete chloride ion permeability resistance detection device and method for field environment - Google Patents
Concrete chloride ion permeability resistance detection device and method for field environment Download PDFInfo
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- CN114264589A CN114264589A CN202111645626.4A CN202111645626A CN114264589A CN 114264589 A CN114264589 A CN 114264589A CN 202111645626 A CN202111645626 A CN 202111645626A CN 114264589 A CN114264589 A CN 114264589A
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 80
- 239000004567 concrete Substances 0.000 title claims abstract description 74
- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 230000010220 ion permeability Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 9
- 238000012360 testing method Methods 0.000 claims abstract description 196
- 238000007789 sealing Methods 0.000 claims abstract description 43
- 239000000243 solution Substances 0.000 claims description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 238000002347 injection Methods 0.000 claims description 23
- 239000007924 injection Substances 0.000 claims description 23
- 230000007246 mechanism Effects 0.000 claims description 21
- 239000012153 distilled water Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 5
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims 3
- 238000004891 communication Methods 0.000 claims 1
- 229910052801 chlorine Inorganic materials 0.000 abstract 1
- 239000000460 chlorine Substances 0.000 abstract 1
- -1 chlorine ions Chemical class 0.000 abstract 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 10
- 239000012466 permeate Substances 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 230000035515 penetration Effects 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical group O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 230000005012 migration Effects 0.000 description 4
- 238000013508 migration Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 241000220317 Rosa Species 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
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Abstract
The invention relates to a concrete chlorine ion permeability resistance detection device and a concrete chlorine ion permeability resistance detection method for an on-site environment, wherein the concrete chlorine ion permeability resistance detection device comprises an anode test tank and a cathode test tank, sealing devices are arranged at two ends of the anode test tank and the cathode test tank, the anode test tank and the cathode test tank are connected through a pressure loading device, an anode electrode connected with power supply equipment is arranged in the anode test tank, a cathode electrode connected with the power supply equipment is arranged in the cathode test tank, a chlorine ion selective electrode and a reference electrode are further arranged in the anode test tank, and the reference electrode can generate a potential difference with the chlorine ion selective electrode under the condition that chlorine ions enter the anode test tank.
Description
Technical Field
The invention relates to the technical field of engineering test equipment, in particular to a concrete chloride ion permeability resistance detection device and method for an on-site environment.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The reinforced concrete members are affected by factors such as load, external environment and the like in the service period of the structure, so that the deterioration problem of different degrees can occur. Among them, the problem of concrete cracking and the like caused by the penetration of chloride ions into the concrete is very prominent in coastal areas and areas with many salt lakes. Therefore, the method has important significance for detecting the impermeability of the chloride ions in the concrete.
At present, the impermeability of a concrete structure is mainly determined through an electric flux test, and the test is carried out aiming at indoor test pieces with specific sizes, but the chlorine ion penetration resistance of the concrete with a designed depth cannot be determined according to requirements. The indoor test device can not be applied to field impermeability detection, and a test piece needs to be saturated with water before an electric flux test is carried out, so that the water saturation work is difficult to develop on the field; meanwhile, the result of the electric flux test is that all ions in the cathode solution pass through the electric flux of the test piece after being electrified and accelerated, not only are chloride ions, but also the measured result cannot accurately and quantitatively explain the capability of the concrete in resisting the penetration of the chloride ions. Therefore, the invention is needed to invent a concrete impermeability detection device which is used on site, can measure the chlorine ion penetration resistance of concrete accurately for the micro-damage of a concrete structure.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a concrete chloride ion permeation resistance detection device for an on-site environment, which can be used on site and can accurately measure the chloride ion permeation resistance of concrete.
In order to achieve the purpose, the invention adopts the following technical scheme
In a first aspect, embodiments of the present invention provide a concrete chloride ion permeation resistance detection apparatus for an on-site environment, including an anode test tank and a cathode test tank, where two ends of the anode test tank and the cathode test tank are both provided with a sealing device, the anode test tank and the cathode test tank are connected through a pressure loading device, an anode electrode connected to a power supply device is disposed in the anode test tank, a cathode electrode connected to the power supply device is disposed in the cathode test tank, the anode test tank is further provided with a chloride ion selective electrode and a reference electrode, and the reference electrode is capable of generating a potential difference with the chloride ion selective electrode when chloride ions enter the anode test tank.
Optionally, the pressure loading device includes a connection mechanism, one end of the connection mechanism is connected to the anode test cell, the other end of the connection mechanism is connected to the cathode test cell, an air bag is arranged on the periphery of the connection mechanism, and the air bag is connected to the inflation device.
Optionally, the connecting mechanism adopts a telescopic mechanism, and comprises a fixing part connected with the cathode test tank and a telescopic part connected with the anode test tank, and the fixing part is connected with the telescopic part in a telescopic manner.
Optionally, the anode test tank is provided with an anode conducting strip, one end of the anode conducting strip is connected with the anode electrode, the other end of the anode conducting strip is connected with the power supply device through a wire, correspondingly, the cathode test tank is internally provided with a cathode conducting strip, one end of the cathode conducting strip is connected with the cathode electrode, and the other end of the cathode conducting strip is connected with the power supply device.
Optionally, the anode test tank and the cathode test tank both adopt an annular cylinder structure, the outer cylinder wall of the anode test tank and the cathode test tank is provided with a liquid outlet hole, correspondingly, the anode electrode and the cathode electrode are both annular electrodes,
optionally, the anode test cell is provided with an anode solution injection pipe communicated with an inner space thereof, and the cathode test cell is provided with a cathode solution injection pipe communicated with an inner space thereof.
Optionally, the anode test cell is further provided with a water injection pipe for injecting water into a space between the anode test cell and the cathode test cell.
Optionally, the reference electrode is a saturated calomel electrode.
Optionally, the sealing device includes a sealing ring, a resistance wire is arranged inside the sealing ring, and the sealing ring is further provided with gas capable of expanding when heated.
In a second aspect, embodiments of the present invention provide an apparatus and a method for detecting chloride ion permeability resistance of concrete in an on-site environment, comprising the following steps:
drilling a hole on the surface of the concrete to be tested;
placing an anode test tank and a cathode test tank which are connected by a pressure loading device into the drilled hole, attaching a sealing device to the wall of the drilled hole, and sealing by using the sealing device;
injecting distilled water into a sealed space between the anode test tank and the cathode test tank, and applying pressure towards the wall of the drilled hole to the injected distilled water by using a pressure loading device so that the distilled water extends into the concrete to saturate the concrete;
injecting a cathode solution into the cathode test tank, injecting an anode solution into the anode test tank, connecting the anode electrode and the cathode electrode with power supply equipment, outputting a set voltage by the power supply equipment, and starting timing;
and when a potential difference is generated between the chloride ion selective electrode and the reference electrode, stopping timing to obtain the time for the chloride ions to penetrate through the concrete in unit depth.
The invention has the beneficial effects that:
1. the device can be placed in a drill hole arranged on the surface of a concrete structure, the cathode solution permeates into the concrete and permeates into the anode solution through the sealing device, the time for the chloride ions to permeate through the concrete in unit depth can be obtained through the time for generating potential difference between the chloride ion selective electrode and the reference electrode, the whole test can be carried out on a construction site, and the impermeability test can be conveniently carried out on the site.
2. According to the device, air is injected into the air bag to expand the air bag through the arrangement of the air bag and the water injection pipe, and a certain pressure is applied to distilled water in the middle area of the two test tanks by adopting the method, so that the distilled water can be quickly infiltrated into the concrete, and the water saturation effect on the concrete is achieved.
3. According to the device, the anode test tank is provided with the chloride ion selective electrode, and after the chloride ion selective electrode induces that chloride ions permeate from the cathode solution to the anode solution through concrete, a potential difference is generated to form a loop with the reference electrode. The chloride ion selective electrode can only sense chloride ions in the solution and cannot sense other ions, so that the interference of the other ions in the solution on the test result is eliminated, and the capability of resisting the penetration of the chloride ions of the concrete can be tested more accurately and efficiently.
4. According to the device, the impermeability of concrete at different depths can be measured as required by arranging the telescopic mechanism, so that the universality of the device is improved.
5. According to the device, the sealing device adopts the sealing ring provided with the resistance wire, and the sealing ring is internally provided with the gas capable of expanding by heating, so that the whole device is firmly and tightly arranged in the pre-drilled hole, and meanwhile, the water saturation area between the two test tanks can be ensured to have better air tightness.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present invention;
FIG. 2 is a schematic view showing the state of the anode test cell and the cathode test cell in the drilled holes in example 1 of the present invention;
FIG. 3 is a front view of an anode test cell according to example 1 of the present invention;
FIG. 4 is a top view of an anode test cell according to example 1 of the present invention;
FIG. 5 is a schematic diagram of a structure of a chloride selective electrode in example 1 of the present invention;
FIG. 6 is a schematic view of the sealing device according to embodiment 1 of the present invention;
FIG. 7 is a schematic structural view of a telescopic mechanism according to embodiment 1 of the present invention;
FIG. 8 is a front view of a chassis structure according to embodiment 1 of the present invention;
FIG. 9 is a top view of the structure of the chassis according to embodiment 1 of the present invention;
FIG. 10 is a front view of the chassis of embodiment 1 of the present invention extended to the longest position;
FIG. 11 is a schematic structural view of an inflator in accordance with embodiment 1 of the present invention;
FIG. 12 is a schematic view of the deceleration pipe structure according to embodiment 1 of the present invention;
wherein, 1, an anode test groove, 2, a cathode test groove, 3, an inner cylinder wall, 4, an outer cylinder wall, 5, a liquid outlet hole, 6, an anode electrode, 7, a cathode electrode, 8, an anode conducting strip, 9, a test host, 10, a cathode conducting strip, 11, an anode solution injection pipe, 12, a cathode solution injection pipe, 13, a chloride ion selective electrode, 14, a reference electrode, 14-1, an electrode membrane, 14-2, an electrode pipe, 14-3, an electrode cap, 14-4, an electrode lead, 15, a sealing device, 16, a resistance wire, 17, a heating controller, 18, an air bag, 19, an air injection hole, 20, an air charging device, 21, an outer shell, 22, a lifting rod, 23, a bearing, 24, a motor, 25, a wireless signal receiver, 26, an inner cylinder, 27, a middle cylinder, 28, an outer cylinder, 29, a water injection pipe, 30, an impeller and a 31, an air inlet, 32. deceleration pipeline, 33, air outlet.
Detailed Description
Example 1
The embodiment provides a concrete chloride ion permeability resistance detection device for an on-site environment, which comprises an anode test tank 1, a cathode test tank 2 and a pressure loading device arranged between and connecting the anode test tank 1 and the cathode test tank 2, wherein the chloride ion migration device formed by the anode test tank 1 and the cathode test tank 2 can be placed in a drilled hole formed in the surface of a concrete structure to be detected, as shown in fig. 1-4.
The anode test tank 1 and the cathode test tank 2 are both of annular cylinder structures and comprise an inner cylinder wall 3 and an outer cylinder wall 4 which are coaxially arranged, a top plate is arranged between the top ends of the inner cylinder wall 3 and the outer cylinder wall 4, and a bottom plate is arranged between the bottom ends. The cylinder structure is internally provided with an annular cavity, the cavity of the anode test tank 1 is used for containing anode solution, and the cavity of the cathode test tank 2 is used for containing cathode solution.
The outer cylinder wall of the anode test tank 1 is provided with a plurality of liquid outlet holes 5 for anode solution to permeate into the concrete structure, and the outer cylinder wall of the cathode test tank 2 is provided with a plurality of liquid outlet holes for cathode solution to permeate into the concrete structure.
An annular anode electrode 6 is arranged in the annular cavity of the anode test cell 1, and an annular cathode electrode 7 is arranged in the annular cavity of the cathode test cell 2.
The anode electrode 6 is fixed with one end of the anode conducting strip 8, the other end of the anode conducting strip 8 passes through the top plate of the anode test cell and then is connected with the anode of the power supply device through a wire, and the power supply device of the embodiment is a test host machine 9.
The cathode electrode 7 is fixed with one end of a cathode conducting strip 10, and the other end of the cathode conducting strip 10 passes through the pressure loading device, passes through the anode test groove through a cathode conducting strip preformed hole on the anode test groove and then is connected with the cathode of the power supply equipment through a lead.
In this embodiment, a part of the outer surface of the cathode conductive sheet 10 passing through the pressure loading unit and the anode test cell was coated with an insulating layer.
The test host 9 can output a set voltage to the anode electrode 6 and the cathode electrode 7.
The roof of anode test groove 1 is provided with anode solution filling tube 11 for pour into anode solution into the anode test groove, the anode solution of this embodiment is 0.3 mol/L's NaOH solution, the roof of cathode test groove is equipped with cathode solution filling tube 12, cathode solution filling tube 12 passes pressure loading device, and pass anode test groove 1 through the cathode solution filling hole that anode test groove 1 was reserved, the cathode solution filling tube is used for adding cathode solution to the cathode test groove, the cathode solution of this embodiment is 3% NaCl solution.
And a chloride ion selective electrode 13 and a reference electrode 14 are also fixed on the top plate of the anode test groove, and the chloride ion selective electrode 13 and the reference electrode 14 extend into the inner space of the anode test groove.
As shown in FIG. 5, the chloride ion selective electrode is prepared by mixing AgCl and Ag2The precipitated mixture of S is pressed into an electrode diaphragm 14-1, the electrode diaphragm 14-1 is fixed at the bottom end of an electrode tube 14-2, the electrode tube 14-2 is a plastic tube, the electrode tube 14-2 is fixed on a top plate of an anode test tank, an electrode cap 14-3 is sleeved at the top end of the electrode tube 14-2, one end of an electrode lead 14-4 penetrates through the electrode cap 14-3 to be connected with the electrode diaphragm 14-1 at the bottom of the electrode tube, and the other end of the electrode lead 14-4 is connected with a chloride ion selective electrode interface of a test host machine 9.
The reference electrode 14 is a saturated calomel electrode, and is formed by contacting saturated solution of mercury and mercurous chloride in potassium chloride water solution. The top lead of the reference electrode 14 is connected with the top lead of the reference electrode of the test host machine and the reference electrode interface of the test host machine.
And a millivoltmeter positioned inside the test host is connected between the chloride ion selective electrode interface and the reference electrode interface.
The chloride ion selective electrode 13 and the reference electrode 14 are fixed in the chloride ion selective electrode preformed hole and the reference electrode preformed hole on the top plate of the anode test groove, and the chloride ion selective electrode 13 and the reference electrode 14 penetrate into the inside of the anode test groove through the preformed holes and are in contact with the anode solution.
When chloride ions in the cathode solution are accelerated to migrate and permeate into the anode solution through the concrete to be tested with the designed depth, the potential of the chloride ion selective electrode is changed, a potential difference is generated, a loop is formed between the chloride ion selective electrode and the reference electrode, the millivoltmeter senses the potential difference at the moment, an electric signal is sent to a timing module in the test host machine 9 through a lead in the test host machine, the timing module stops timing, and the timing time is displayed on a display screen of the test host machine 9.
As shown in fig. 6, the sealing device 15 includes a sealing ring made of a flexible material, a resistance wire 16 is disposed in the sealing ring, the resistance wire 16 is connected to a heating controller 17, the heating controller 17 is connected to the test host 9 through a wireless signal transmitter in the test host 9, and can receive an instruction of the test host 9 to operate, the sealing ring is filled with a gas capable of expanding when heated, and the gas in this embodiment is carbon dioxide.
After the device begins to work, heating resistance wire 16 through heating controller 17 for carbon dioxide gas volume increases, thereby makes the sealing washer volume increase, makes whole sealing device firmly place closely in the hole of getting of drilling in advance, can guarantee simultaneously that the confined space that forms between cathodic test groove 2 and the anodic test groove 1 has better gas tightness. The wireless signal emitter is arranged inside the test host machine 9, and the heating controller 17 in the sealing ring can be controlled to heat the resistance wire 16 through the wireless signal emitter inside the test host machine, so that CO is enabled to be generated2The volume of the gas is increased, and the gas is discharged,and then make the sealing washer inflation for whole device firmly closely settles in the hole of drilling in advance, can guarantee simultaneously that the middle water saturation region in cathode test groove 2 and anode test groove 1 has better gas tightness. When the resistance wire 16 is heated to 130 ℃, the temperature is maintained and is not increased any more, and the volume of the sealing ring is not increased any more. After the test is finished, the heating controller 17 is turned off, the temperature of the resistance wire 16 is reduced, and CO is added2The gas volume is reduced, so that the volume of the sealing ring is reduced, and the whole device can be taken out from the hole after the volume is reduced to a certain degree.
A pressure loading device is arranged between the anode test tank 1 and the cathode test tank 2, and the anode test tank and the cathode test tank are connected through the pressure loading device.
The pressure loading device comprises a connecting mechanism and an air bag 18 arranged on the periphery of the connecting mechanism, the air bag 18 is arranged between the anode test tank 1 and the cathode test tank 2, the top end of the air bag 18 is connected with an inflation tube, and the inflation tube penetrates through the anode test tank through a gas injection hole 19 reserved in the anode test tank and then is connected with an inflation device 20.
The coupling mechanism in this embodiment adopts telescopic machanism, can adjust the distance between anode test groove 1 and the cathode test groove 2, and then can survey the impermeability of different degree of depth concrete as required, has improved the commonality of device.
The telescopic mechanism comprises a fixed part and a telescopic part, the fixed part is connected with the cathode test tank 2, and the telescopic part is connected with the anode test tank 1.
In one embodiment, the telescoping mechanism may be an electric telescoping rod or a pneumatic cylinder.
In another embodiment, as shown in fig. 7, the telescoping mechanism comprises an outer housing 21, a chassis and a lifting rod 22.
The bottom end of the lifting rod 22 is fixedly connected with an output shaft of a motor 24 arranged on the chassis, and the motor 24 is connected with the test host machine 9 through a wireless signal receiver 25 arranged on the chassis and can receive the instruction of the test host machine 9 for working.
The chassis is also provided with a battery pack for supplying power to the wireless signal receiver and the motor.
As shown in fig. 8-10, the chassis comprises an inner cylinder 26, a middle cylinder 27 and an outer cylinder 28 which are telescopically connected, the outer cylinder 28 is sleeved on the periphery of the middle cylinder 27 and is telescopically connected with the middle cylinder 27, and the middle cylinder 27 is sleeved on the periphery of the inner cylinder 26 and is telescopically connected with the inner cylinder 26. The motor 24, the battery pack and the wireless signal receiver are all arranged at the top of the inner cylinder 26, and the bottom surface of the outer cylinder 28 is fixedly connected with the top of the cathode test cell 2.
In this embodiment, in order to prevent the chassis from rotating, the inner cylinder 26 and the middle cylinder 27 are rectangular cylinders, which cannot rotate around their axes, the top of the outer cylinder 28 is fixedly connected with the bottom of the outer casing 21, and the outer cylinder 28 is a cylindrical cylinder in order to facilitate the connection between the outer cylinder 28 and the outer casing 21.
A limit table is arranged between the inner cylinder 26 and the middle cylinder 27 to prevent the inner cylinder 26 and the middle cylinder 27 from separating, and a limit table is also arranged between the middle cylinder 27 and the outer cylinder 28 to prevent the middle cylinder 27 and the outer cylinder 28 from separating.
The bottom of the lifting rod 22 is fixed through an output shaft of a motor 24 capable of rotating bidirectionally, and the bottom of the motor 24 is provided with a battery pack and a wireless signal receiver 25 which are embedded in an inner cylinder 26 of a liftable chassis. Wherein, wireless signal receiver 25 can receive the wireless signal who sends from test host 9 to the output shaft of control motor 24 rotates, and then drives lifter 22 upwards rotation in outside casing 21, thereby makes lifter 22 rise, and when lifter 22 rose, motor 24 can rise simultaneously, can drive the chassis and produce the extension motion, thereby reaches the effect that lets lifter 22 extend. On the contrary, send a radio signal that rotates the opposite direction at this moment through test host 9, can control motor 24's output shaft after wireless signal receiver 25 receives and rotate in the opposite direction, and then drive lifter 22 and rotate downwards along outside casing 21 to make lifter 22 descend, when lifter 22 descends, motor 24 can descend simultaneously, can drive the chassis and produce the shrink motion, thereby reach the effect that lets the lifter shorten.
The airbag 18 is connected to an inflator 20 through an intake duct. Water injection pipe 29 is installed through the water injection hole in positive pole test groove 1, the space between water injection pipe 29 and positive pole test groove 1 and the cathodic test groove 2 is linked together, in yin, behind the injection distilled water through water injection pipe 29 in the middle of the two test grooves of positive, through the gas tube that gasbag 18 upper portion is connected, to the inside air of certain volume of pouring into of gasbag 18, make its inflation, thereby give the regional distilled water constant pressure of saturated water in the middle of the two test grooves, make it can permeate the concrete inside with higher speed, thereby play the water saturation effect to the concrete. Wherein, the distance between the air bag and the side wall of the concrete hole is about 3mm before the air bag is inflated, and the distance between the air bag and the side wall of the concrete hole is about 0.5mm after the air bag is inflated.
As shown in fig. 11-12, the inflator includes an inflatable casing, the bottom of the casing is provided with a rotatable impeller 30 and an air inlet 31, the top of the casing is provided with a speed reducing pipeline 32, the speed reducing pipeline is a reducing pipeline, the pipe diameter of the air inlet end is smaller than that of the air outlet end, so as to reduce the speed of air, the top of the inflatable casing is provided with an air outlet 33, the air outlet 33 is connected with the air bag 18 through an inflation pipeline, the anode test cell is provided with an air injection hole, and the inflation pipeline passes through the anode test cell through the air injection hole and then is connected with the air bag
After the inflator 20 is powered on, the impeller 30 starts to rotate, air is sucked from the air inlet 31 and sent into the speed reduction pipeline 32 of the air, and the air enters the airbag 18 through the air outlet 33 and the inflation tube after passing through the pipeline. The deceleration pipe 32 can ensure that the gas is uniformly and stably input into the air bag.
The test host is divided into three modules, namely a chloride ion migration acceleration module, a timing module and a chloride ion detection module, the three modules are connected through an internal lead of the test host 9, the chloride ion migration acceleration module is used as power supply equipment and can apply 60V direct current voltage to the anode electrode and the cathode electrode, so that chloride ion migration is accelerated, and an electric signal is sent to the timing module through an internal lead of the host 20 while voltage is applied, so that the timing module starts timing. The chloride detection module includes a chloride selective electrode 13, a reference electrode 14, and a millivoltmeter.
The device of this embodiment needs to bore hole in advance at the concrete surface that awaits measuring, and its degree of depth can be adjusted according to the degree of depth of awaiting measuring the concrete.
In the apparatus of this example, the solution injected into the cathode test cell was a 3% NaCl solution by mass concentration. The solution injected into the anode test cell was NaOH solution with a molar concentration of 0.3 mol/L.
In the device of the embodiment, the chloride ion selective electrode is soaked and activated in 10-3mol/L NaCl solution for 1 hour before use, and then is repeatedly washed by deionized water.
Example 2
The embodiment provides a working method of the concrete impermeability detection device used in the construction site in embodiment 1, which includes the following steps:
(1) firstly, a hole needs to be drilled in advance on the surface of the concrete to be measured, and the depth of the hole can be adjusted according to the actual depth of the concrete to be measured. The diameter of the drilled hole is slightly larger than the diameter of the anode test tank 1 and the cathode test tank 2. Before use, the chloride ion selective electrode 13 is soaked in 10-3mol/L NaCl solution for activation for 1h, and then is repeatedly washed by deionized water. Then, the chlorine ion selective electrode 13 is inserted into the chlorine ion selective electrode prepared hole on the upper surface of the anode test cell 1.
(2) The telescopic mechanism is adjusted to be lifted through the test host machine 9 until the telescopic mechanism is adjusted to the required test distance. The length of the telescopic mechanism at this time is recorded as the depth of the chloride ions penetrating through the concrete to be measured. The device is inserted into the hole, and the device needs to be kept slowly and at a constant speed during insertion so as to prevent the sealing ring of the impermeability detection device from being scratched by the concrete side wall in the insertion process, thereby influencing the air tightness of the device. Then the heating controller 17 in the sealing ring heats the resistance wire 16 through the test host, so that CO is generated2The gas volume increases and the sealing ring expands, so that the whole device is firmly and tightly arranged in the pre-drilled hole, and meanwhile, the cathode test tank 2 can be ensuredAnd the middle part of the anode test cell 2 has better air tightness. After the resistance wire is heated to 130 ℃, the heating controller starts to maintain the temperature, the temperature does not rise any more, and the volume of the sealing ring does not increase any more.
(3) After accomplishing the installation of witnessed inspections concrete chloride ion impermeability device, earlier through the water injection pipe to the sealed space at two experimental groove middle parts of negative, a certain amount of distilled water is injected into to the positive, fill in the water injection pipe with the sealing plug, the certain volume of air is injected into to gasbag 18 inside to rethread aerating device, make the distance between gasbag 18 and the concrete lateral wall shorten to 0.5mm from 3mm, and then give the inside distilled water certain pressure of sealed space, make inside it can accelerate the infiltration concrete, thereby play the effect of saturated water to the concrete.
(4) After the water saturation is finished, NaCl solution with the mass concentration of 3% is injected into the cathode test tank 2 through the cathode solution injection pipe. NaOH solution with a molar concentration of 0.3mol/L was injected into the anodic test cell 1 through the anodic solution injection tube.
(5) The cathode and anode two guide plates are respectively connected with the cathode and the anode of the test host machine 9, the power supply of the test host machine 9 is switched on, and 60V direct current voltage is applied to the two anode electrodes and the cathode electrode. Meanwhile, the timing module starts timing. When chloride ions in the cathode solution are accelerated to migrate and permeate into the anode solution through the concrete to be tested with the designed depth, the potential of the chloride ion selective electrode is changed along with the chloride ions to generate a potential difference, the potential difference and the reference electrode form a loop, the millivoltmeter senses the potential difference at the moment, an electric signal is sent to the timing module through a lead inside the host, the timing module stops timing, and the timed time is displayed on the display screen.
(6) When chloride ions in the cathode solution are accelerated to migrate and permeate into the anode solution through the concrete to be tested with the designed depth, the chloride ion detection module in the test host senses potential difference, an electric signal is sent to the timing module through a lead in the test host, the timing module stops timing, and the timed time is displayed on the display screen. And calculating the time for the chloride ions to penetrate through the concrete in unit depth so as to evaluate the chloride ion permeation resistance of the concrete, thereby achieving the purpose of detecting the chloride ion impermeability on site.
By adopting the device of the embodiment, the diameter of the drilled hole on the concrete surface is smaller, the influence on the concrete structure is relatively smaller, the repairing is easy, and the purpose of detecting the micro-damage of the concrete structure is realized.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A concrete anti chloride ion permeability detection device for site environment, a serial communication port, including anode test groove and cathode test groove, the both ends in anode test groove and cathode test groove all are equipped with sealing device, connect through pressure loading device between anode test groove and the cathode test groove, be equipped with the anode electrode who is connected with power supply unit in the anode test groove, be equipped with the cathode electrode who is connected with power supply unit in the cathode test groove, the anode test groove still is equipped with chloride ion selective electrode and reference electrode, the reference electrode can produce the potential difference with chloride ion selective electrode under the condition that chloride ion gets into the anode test groove.
2. The apparatus for detecting chloride ion permeability of concrete for an on-site environment according to claim 1, wherein the pressure loading unit includes a connection mechanism having one end connected to the anode test cell and the other end connected to the cathode test cell, and an air bag is disposed around the connection mechanism and connected to the air charging unit.
3. The apparatus for testing chlorine ion permeability of concrete for an on-site environment according to claim 2, wherein the connection mechanism is a telescopic mechanism including a fixed portion connected to the cathodic test cell and a telescopic portion connected to the anodic test cell, the fixed portion and the telescopic portion being telescopically connected.
4. The apparatus for detecting chlorine ion permeability of concrete for an on-site environment as claimed in claim 1, wherein the anode test cell is provided with an anode conductive strip, one end of the anode conductive strip is connected to the anode electrode, and the other end is connected to the power supply device through a wire, and correspondingly, the cathode test cell is provided with a cathode conductive strip, one end of the cathode conductive strip is connected to the cathode electrode, and the other end is connected to the power supply device.
5. The apparatus for detecting chlorine ion permeability of concrete in situ according to claim 1, wherein the anode test cell and the cathode test cell are both in a ring-shaped cylinder structure, the outer cylinder wall of the anode test cell and the outer cylinder wall of the cathode test cell are provided with liquid outlet holes, and correspondingly, the anode electrode and the cathode electrode are both ring-shaped electrodes. .
6. The apparatus for testing chlorine ion permeability of concrete for an in-situ environment according to claim 1, wherein the anodic test cell is provided with an anodic solution injection pipe communicating with an inner space thereof, and the cathodic test cell is provided with a cathodic solution injection pipe communicating with an inner space thereof.
7. The apparatus for testing chlorine ion permeability of concrete for an on-site environment according to claim 1, wherein the anode test cell is further provided with a water injection pipe for injecting water into a space between the anode test cell and the cathode test cell.
8. The apparatus for detecting chloride ion permeability of concrete for an in-situ environment of claim 1, wherein said reference electrode is a saturated calomel electrode.
9. The apparatus for detecting chloride ion permeability resistance of concrete for an on-site environment as claimed in claim 1, wherein said sealing means comprises a sealing ring, a resistance wire is disposed inside the sealing ring, and a gas capable of expanding by heat is further disposed in the sealing ring.
10. The working method of the concrete chloride ion permeability resistance detection device for the field environment is characterized by comprising the following steps of:
drilling a hole on the surface of the concrete to be tested;
placing an anode test tank and a cathode test tank which are connected by a pressure loading device into the drilled hole, attaching a sealing device to the wall of the drilled hole, and sealing by using the sealing device;
injecting distilled water into a sealed space between the anode test tank and the cathode test tank, and applying pressure towards the wall of the drilled hole to the injected distilled water by using a pressure loading device so that the distilled water extends into the concrete to saturate the concrete;
injecting a cathode solution into the cathode test tank, injecting an anode solution into the anode test tank, connecting the anode electrode and the cathode electrode with power supply equipment, outputting a set voltage by the power supply equipment, and starting timing;
and when a potential difference is generated between the chloride ion selective electrode and the reference electrode, stopping timing to obtain the time for the chloride ions to penetrate through the concrete in unit depth.
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