CN103900934A - Method for characterizing diffusion behavior of water in asphalt - Google Patents
Method for characterizing diffusion behavior of water in asphalt Download PDFInfo
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- CN103900934A CN103900934A CN201310655724.5A CN201310655724A CN103900934A CN 103900934 A CN103900934 A CN 103900934A CN 201310655724 A CN201310655724 A CN 201310655724A CN 103900934 A CN103900934 A CN 103900934A
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Abstract
The invention provides a method for characterizing a diffusion behavior of water in asphalt. According to the method, a property that the dielectric constant difference of the water and the asphalt is relatively great is utilized; when the water is diffused in the asphalt, the dielectric constant of the asphalt is changed and the capacitance is also changed; the diffusion of the water in the asphalt is determined by the change of the capacitance value of the asphalt. According to the method, the testing voltage ranges 100mV from 200mV and the scanning frequency ranges 300KHz from 9MHz.
Description
Technical field
The present invention relates to a kind of method that characterizes water dispersal behavior in pitch, belong to Material Field.
Background technology
Characterize water method of dispersal behavior in pitch and mainly contain mass method, infrared spectrum-Attenuated Total Reflectance and Diffusion-Through method.
Mass method is to utilize the variation that is soaked in the asphalt membrane quality in water to be measured to characterize the dispersal behavior of water in pitch, when test, first pitch is coated on glass sheet equably, form one deck asphalt membrane, weigh and record its quality, then the glass sheet that is coated with asphalt membrane is put into water to be measured, at interval of regular hour taking-up glass sheet, dry up testing sample, weigh and record its quality, thereby obtain the mass change curve of the asphalt membrane that is soaked in water.Though the method is simple to operate, but to constantly from water, take out working sample and dry up, in the diffusion process of cutting off the water supply in pitch, can not truly reflect the dispersal behavior process of water in pitch, and in pitch, also have some solable matters and enter into water, the mass change of asphalt membrane can not truly reflect water dispersal behavior therein.
It is wave number 3000cm in infrared spectrum that infrared spectrum-Attenuated Total Reflectance is utilized the stretching vibration peak of hydroxyl in hydrone
-1-3650cm
-1the absorption peak at place, the intensity of hydroxyl stretching vibration peak can strengthen with hydrone in pitch, and the intensity of measuring different time points hydroxyl stretching vibration peak reflects the diffusion of water in pitch.The method test result is more accurate, but in test process, require the very thin thickness of asphalt film, higher to asphalt membrane thickness requirement, the preparation difficulty of asphalt film is larger, test process needs special test equipment and the long-time engaged test equipment of needs, and plant factor is very low.
Diffusion-Through method is interface and the inner material concentration gradient that forms of pitch of utilizing water to contact with pitch, thereby water is diffused in pitch, ion in water is remained in pitch space by the effect of asphalt component, and continuation absorbs moisture, form permeable layer, the cavity structure that much contains ion in permeable layer causes the volumetric expansion of pitch, is conducive to entering of hydrone, and then makes water-soluble component in pitch oozing out and constantly separate out with water.The content of the radiotracer of separating out by mensuration characterizes the water-soluble component amount of separating out in pitch, and then characterizes the dispersal behavior of water in pitch.This method need to adopt radioelement as tracer agent, when operation inconvenient and exist cost high, environment is had to problems such as pollution.
Summary of the invention
For overcome that said method exists can not actual response water the preparation of dispersal behavior in pitch, asphalt film be difficult to operation, plant factor low, use high operation and the environmental pollution problem of being not easy to of tracer agent cost, the invention provides a kind of method of brand-new sign water dispersal behavior in pitch, can truly reflect water diffusion process in pitch, easy to operate, equipment efficiency of usage is high, pollution-free and with low cost.
Object of the present invention is realized by following technical scheme:
Using the electrically-conductive backing plate of surface coverage asphalt film as working electrode, using carbon-point as to electrode, using water as electrolytic solution, by described working electrode, to electrode and electrolytic solution composition test electrode system;
Test electrode system is connected with electrochemical workstation, sets test voltage and the sweep frequency of electrochemical workstation, read electrochemical workstation at interval of a period of time and test the data obtained, obtain Nyquist figure and Bode figure;
According to obtaining Nyquist figure and the Bode figure shape at different time, select the equivalent-circuit model of immersion initial stage organic coating metal system or the equivalent-circuit model of immersion organic coating metal system in mid-term, use matching software to carry out matching, the capacitance of pitch while obtaining different soak time to the data of Nyquist figure and Bode figure;
Draw pitch capacitance curve over time according to the capacitance obtaining, can characterize the dispersal behavior of water in pitch.
As the improvement to technical solution of the present invention, electrically-conductive backing plate adopts metal substrate.
As the further improvement to technical solution of the present invention, metal substrate be in aluminium sheet, copper coin, corrosion resistant plate, aluminium alloy plate, steel plate and zine plate any.
As the improvement to technical solution of the present invention, the electrically-conductive backing plate of surface coverage asphalt film adopts following methods to make, electrically-conductive backing plate is heated and remain on 60 ℃-100 ℃, asphalt heating to 60 ℃-80 ℃ is coated on to the electrically-conductive backing plate after heating, with blade, pitch is evenly coated with and is scraped at electrically-conductive backing plate.
As the improvement to technical solution of the present invention, electrically-conductive backing plate smooth surface.
As the improvement to technical solution of the present invention, before test, heat water to boiling and be then cooled to room temperature.
As the improvement to technical solution of the present invention, test voltage is set as the arbitrary numerical value between 100mV to 200mV, preferably 150mV.
As the improvement to technical solution of the present invention, sweep frequency is set as 300KHz to 9MHz.
Technical solution of the present invention has following beneficial effect:
The present invention utilizes water and the larger feature of pitch difference in dielectric constant, after water is diffused in pitch can there is corresponding variation in the electrochemical characteristic of pitch, with water diffusion, respective change occurs by pitch capacitance and characterize the dispersal behavior of water in pitch, therefore technical scheme of the present invention goes for larger, a kind of material of any two kinds of difference in dielectric constant and can be spread to the situation in another kind of material.
Technical solution of the present invention does not need to weigh soaks rear asphalt quality, can avoid the impact of water-soluble material on test result in the interruption of water diffusion process and pitch, guarantees the true and accurate of measurement result.
Technical solution of the present invention is not high to the thickness requirement of asphalt film, makes asphalt film easy and simple to handle.
Technical solution of the present invention is utilized self-built test pool and conventional electrochemical workstation, without using radiotracer, pollution-free, cost is low.
The connection of technical solution of the present invention electrochemical workstation is simple, when convenient disassembly and test, without taking for a long time sensing equipment, can effectively improve plant factor.
Accompanying drawing explanation
Fig. 1 is water dispersal behavior test schematic diagram in pitch.
Fig. 2 is the equivalent-circuit model A of immersion initial stage organic metal coating system.
Fig. 3 is the equivalent-circuit model B that soaks organic metal coating system in mid-term.
Fig. 4 is test tap water dispersal behavior gained Nyquist figure and Bode figure in a pitch, test voltage 100mV, test scan frequency 300KHz-9MHz.
Fig. 5 is matching gained pitch capacitance variation curve map, test voltage 100mV, test scan frequency 300KHz-9MHz.
Fig. 6 is test tap water dispersal behavior gained Nyquist figure and Bode figure in a pitch, test voltage 150mV, test scan frequency 300KHz-9MHz.
Fig. 7 is matching gained pitch capacitance variation curve map, test voltage 150mV, test scan frequency 300KHz-9MHz.
Fig. 8 is test tap water dispersal behavior gained Nyquist figure and Bode figure in a pitch, test voltage 200mV, test scan frequency 300KHz-9MHz.
Fig. 9 is matching gained pitch capacitance variation curve map, test voltage 200mV, test scan frequency 300KHz-9MHz.
Figure 10 is test tap water dispersal behavior gained Nyquist figure and Bode figure in b pitch, test voltage 100mV, test scan frequency 300KHz-9MHz.
Figure 11 is matching gained pitch capacitance variation curve map, test voltage 100mV, test scan frequency 300KHz-9MHz.
Figure 12 is test tap water dispersal behavior gained Nyquist figure and Bode figure in b pitch, test voltage 150mV, test scan frequency 300KHz-9MHz.
Figure 13 is matching gained pitch capacitance variation curve map, test voltage 150mV, test scan frequency 300KHz-9MHz.
Figure 14 is test tap water dispersal behavior gained Nyquist figure and Bode figure in b pitch, test voltage 200mV, test scan frequency 300KHz-9MHz.
Figure 15 is matching gained pitch capacitance variation curve map, test voltage 200mV, test scan frequency 300KHz-9MHz.
Figure 16 is test tap water dispersal behavior gained Nyquist figure and Bode figure in c pitch, test voltage 100mV, test scan frequency 300KHz-9MHz.
Figure 17 is matching gained pitch capacitance variation curve map, test voltage 100mV, test scan frequency 300KHz-9MHz.
Figure 18 is test tap water dispersal behavior gained Nyquist figure and Bode figure in c pitch, test voltage 150mV, test scan frequency 300KHz-9MHz.
Figure 19 is matching gained pitch capacitance variation curve map, test voltage 150mV, test scan frequency 300KHz-9MHz.
Figure 20 is test tap water dispersal behavior gained Nyquist figure and Bode figure in c pitch, test voltage 200mV, test scan frequency 300KHz-9MHz.
Figure 21 is matching gained pitch capacitance variation curve map, test voltage 200mV, test scan frequency 300KHz-9MHz.
Embodiment
The present invention utilizes water and the larger feature of pitch difference in dielectric constant, after water is diffused in pitch, the specific inductive capacity of pitch changes, also there is corresponding variation in its capacitance, along with water is constantly diffused in pitch, the capacitance of pitch also constantly changes, and by the same pitch electrochemical characteristic that is immersed in the different time in water is tested, utilizes pitch capacitance to characterize the dispersal behavior of water in pitch with the change curve of water diffusion.
As an example of a, b, tri-kinds of pitches of c and water example, the specific embodiment of the present invention is described respectively below.
Embodiment mono-
According to the test pool structure shown in Fig. 1, select the thin aluminium sheet of a block length 20cm, wide 10cm as substrate, can make electrochemical workstation normally catch the electrochemical signals of asphalt sample, also can use other metal substrates such as copper coin, zine plate, corrosion resistant plate, steel plate to substitute aluminium sheet.The surface of aluminium sheet should be smooth, so that asphalt membrane even thickness, above-mentioned aluminium sheet is placed on panel heater, heat and keep its temperature at 60 ℃, so that pitch has good mobility in surface of aluminum plate, get appropriate a asphalt heating to 80 ℃, pitch after above-mentioned heating is applied on above-mentioned aluminium sheet, with blade (for example doctor) uniformly by pitch be coated with scrape on aluminium sheet, form smooth, the asphalt membrane of even thickness, by static the aluminium sheet of the above-mentioned covering a asphalt film room temperature that is cooled to, the aluminium sheet of above-mentioned covering asphalt membrane is placed in backing plate as working electrode, vial is placed on asphalt membrane, between vial and asphalt membrane, use O-ring seal to guarantee close contact between vial and asphalt membrane, water is cooled to room temperature through boiling, be placed in vial, carbon-point is as electrode is placed in to water, and maintenance does not contact with asphalt membrane.
After electrochemical workstation is connected with test pool, the test voltage of electrochemical workstation is set to 100mV, test voltage height is related to the accuracy of measurement result, when test voltage is too low, measured signal is not remarkable, test voltage is too high produces destruction to test asphalt film, setting test scan frequency is 300KHz-9MHz, the scale relationships of sweep frequency is flutterred the number of grasping asphalt film signal message to electrochemical workstation, the information of the broader asphalt film obtaining of range of scanned frequencies is more.
In test process, electrochemical workstation applies sinusoidal voltage to test electrode system, from test electrode system feedback output sinusoidal current signal, and then obtains the impedance information data of test electrode system, represents with Nyquist figure and Bode figure.Wherein Nyquist figure is figure impedance real part being done with the imaginary impedance of test electrode system, horizontal ordinate represents test electrode system impedance real part, ordinate represents test electrode system imaginary impedance, the impedance magnitude of Nyquist figure representation test electrode system, Bode figure is the logarithm of test electrode system impedance modulus and the figure that phasing degree is done the logarithm of identical horizontal ordinate sweep frequency, horizontal ordinate is sweep frequency, and ordinate is respectively logarithm and the phasing degree of test electrode system impedance modulus.Test electrode system is carried out to reading by electrochemical workstation at interval of a period of time, the Nyquist figure and the Bode that obtain test electrode system under different soak times scheme.At interval of 0.5 hour or at interval of 1 hour by electrochemical workstation from test electrode system gather a test data, obtain Nyquist figure and Bode figure, as shown in Figure 4, according to the Nyquist figure collecting and the shape of Bode figure, select the equivalent-circuit model B of the equivalent-circuit model A of immersion initial stage organic metal coating system as shown in Figure 2 or immersion organic metal in mid-term coating system as shown in Figure 3, carry out matching by matching software, draw the capacitance of different soak time pitches, draw the change curve of pitch capacitance with soak time, as shown in Figure 5.At the mensuration initial stage, pitch has good obstructing capacity to moisture, select to soak shown in Fig. 2 the equivalent-circuit model A of initial stage organic metal coating system, along with the prolongation of time, moisture is diffused into the interface of pitch inside and pitch and current-carrying plate gradually, now selects to soak shown in Fig. 3 the equivalent-circuit model B of organic metal coating system in mid-term.
The pitch capacitance obtaining according to matching, draws pitch capacitance with soak time change curve, characterizes water dispersal behavior in pitch.
Embodiment bis-
Repeat above-described embodiment one step, while wherein making the substrate that covers asphalt film, electrically-conductive backing plate is heated to 70 ℃, asphalt heating to 75 ℃ by being set, test voltage in test parameter step is set as to 150mV, the Nyquist figure and the Bode that obtain scheme as shown in Figure 6, and pitch capacitance variation curve map as shown in Figure 7.
Embodiment tri-
Repeat above-described embodiment one step, while wherein making the substrate that covers asphalt film, electrically-conductive backing plate is heated to 80 ℃, asphalt heating to 70 ℃ by being set, test voltage in test parameter step is set as to 200mV, the Nyquist figure and the Bode that obtain scheme as shown in Figure 8, and pitch capacitance variation curve map as shown in Figure 9.
Embodiment tetra-
Change test pitch into b pitch, repeat above-described embodiment one step, while wherein making the substrate that covers asphalt film, electrically-conductive backing plate is heated to 90 ℃, the Nyquist that asphalt heating to 65 ℃ is obtained figure and Bode scheme as shown in figure 10, and pitch capacitance variation curve map as shown in figure 11.
Embodiment five
Repeat above-described embodiment four steps, test voltage is set as 150mV, and the Nyquist figure and the Bode that obtain scheme as shown in figure 12, and pitch capacitance variation curve map as shown in figure 13.
Embodiment six
Repeat above-described embodiment four steps, while wherein making the substrate that covers asphalt film, electrically-conductive backing plate is heated to 100 ℃, asphalt heating to a 70 ℃ test voltage is set as to 200mV, and the Nyquist figure and the Bode that obtain scheme as shown in figure 14, and pitch capacitance variation curve map as shown in figure 15.
Embodiment seven
Change test pitch into c pitch, repeat above-described embodiment one step, while wherein making the substrate that covers asphalt film, electrically-conductive backing plate is heated to 100 ℃, the Nyquist that asphalt heating to 60 ℃ is obtained figure and Bode scheme as shown in figure 16, and pitch capacitance variation curve map as shown in figure 17.
Embodiment eight
Repeat above-described embodiment seven steps, test voltage is set as 150mV, and the Nyquist figure and the Bode that obtain scheme as shown in figure 18, and pitch capacitance variation curve map as shown in figure 19.
Embodiment nine
Repeat above-described embodiment seven steps, test voltage is set as 200mV, and the Nyquist figure and the Bode that obtain scheme as shown in figure 20, and pitch capacitance variation curve map as shown in figure 21.
This instructions embodiment mono-to embodiment nine has proved the completely new approach that characterizes water dispersal behavior in pitch, shows that the method is applicable to water and various pitch, and test voltage can be selected between 100mV-200mV.In fact as long as two kinds of difference in dielectric constant larger, situation that a kind of material can be spread to another kind of material all can use technical solutions according to the invention.
The document that this instructions is quoted has been incorporated in literary composition as a reference.The various modifications and variations of technical solution of the present invention embodiment are apparent for those skilled in the art, although technical solution of the present invention is described in conjunction with preferred implementation, should be appreciated that, require the invention of authorizing should unsuitablely not be limited to these concrete embodiments, in fact, for the modifications and variations of various embodiments described in the invention, be all apparent for those skilled in the art, be covered by among technical solution of the present invention.
Claims (9)
1. a method that characterizes water dispersal behavior in pitch, is characterized in that, said method comprising the steps of:
Using the electrically-conductive backing plate of surface coverage asphalt film as working electrode, using carbon-point as to electrode, using water as electrolytic solution, by described working electrode, to electrode and electrolytic solution composition test electrode system;
Test electrode system is connected with electrochemical workstation, sets test voltage and the sweep frequency of electrochemical workstation, read electrochemical workstation at interval of a period of time and test the data obtained, obtain Nyquist figure and Bode figure;
According to obtaining Nyquist figure and the Bode figure shape at different time, select the equivalent-circuit model of immersion initial stage organic coating metal system or the equivalent-circuit model of immersion organic coating metal system in mid-term, use matching software to carry out matching, the capacitance of pitch while obtaining different soak time to the data of Nyquist figure and Bode figure;
Draw pitch capacitance curve over time according to the capacitance obtaining, can characterize the dispersal behavior of water in pitch.
2. the method for sign water according to claim 1 dispersal behavior in pitch, is characterized in that described electrically-conductive backing plate is metal substrate.
3. the method for sign water according to claim 1 dispersal behavior in pitch, it is characterized in that described electrically-conductive backing plate be in aluminium sheet, copper coin, corrosion resistant plate, aluminium alloy plate, steel plate and zine plate any.
4. the method for sign water according to claim 1 dispersal behavior in pitch, the electrically-conductive backing plate that it is characterized in that described surface coverage asphalt film adopts following methods to make, electrically-conductive backing plate is heated and remain on 60 ℃-100 ℃, asphalt heating to 60 ℃-80 ℃ is coated on to the electrically-conductive backing plate after heating, with blade, pitch is evenly coated with and is scraped at electrically-conductive backing plate.
5. according to the method for the sign water dispersal behavior in pitch described in arbitrary claim in claim 1 to 4, it is characterized in that described electrically-conductive backing plate smooth surface.
6. according to the method for the sign water dispersal behavior in pitch described in arbitrary claim in claim 1 to 4, before it is characterized in that testing, heat water to boiling and be then cooled to room temperature.
7. according to the method for the sign water dispersal behavior in pitch described in arbitrary claim in claim 1 to 4, it is characterized in that described test voltage is the arbitrary numerical value between 100mV to 200mV.
8. the method spreading in pitch according to the mensuration water described in arbitrary claim in claim 1 to 4, is characterized in that described test voltage is 150mV.
9. the method spreading in pitch according to the mensuration water described in arbitrary claim in claim 1 to 4, is characterized in that described sweep frequency is 300KHz to 9MHz.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105987943A (en) * | 2015-02-09 | 2016-10-05 | 中国科学院金属研究所 | Embedded microelectrode-based deep sea organic coating performance in-situ detection device |
| CN108956261A (en) * | 2018-09-07 | 2018-12-07 | 香港理工大学 | A kind of preparation method of asphalt film |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007811B (en) * | 2017-11-17 | 2020-02-11 | 哈尔滨工业大学 | Method for dividing diffusion mode of gaseous water in asphalt mortar |
Citations (1)
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| CN103123330A (en) * | 2012-12-19 | 2013-05-29 | 长安大学 | Method for testing asphalt anti-penetrability performance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103123330A (en) * | 2012-12-19 | 2013-05-29 | 长安大学 | Method for testing asphalt anti-penetrability performance |
Non-Patent Citations (1)
| Title |
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| 魏建明: "沥青、集料的表面自由能及水分在沥青中的扩散研究", 《中国博士学位论文全文数据库 工程科技II辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105987943A (en) * | 2015-02-09 | 2016-10-05 | 中国科学院金属研究所 | Embedded microelectrode-based deep sea organic coating performance in-situ detection device |
| CN108956261A (en) * | 2018-09-07 | 2018-12-07 | 香港理工大学 | A kind of preparation method of asphalt film |
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