CN202994716U - Working electrode used during testing of anti-penetrability performance of asphalt by utilizing electrochemical workstation - Google Patents
Working electrode used during testing of anti-penetrability performance of asphalt by utilizing electrochemical workstation Download PDFInfo
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- CN202994716U CN202994716U CN 201220707882 CN201220707882U CN202994716U CN 202994716 U CN202994716 U CN 202994716U CN 201220707882 CN201220707882 CN 201220707882 CN 201220707882 U CN201220707882 U CN 201220707882U CN 202994716 U CN202994716 U CN 202994716U
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- asphalt
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Abstract
The utility model discloses a working electrode used during testing of anti-penetrability performance of asphalt by utilizing an electrochemical workstation. The working electrode comprises a round or square metal sheet, wherein a working face coated with an asphalt film and an insulation face electrically connected with the electrochemical workstation are arranged on the metal sheet, the thickness of the metal sheet is 1.00-2.00 mm, and the area of the working face is 100-400 mm<2>. When the working electrode, disclosed by the utility model, is used for testing the anti-penetrability performance of the asphalt, the anti-penetrability performance of the asphalt is tested by monitoring the variation of the electrochemical property of the asphalt during a water solution soaking process, specifically the electrochemical property of the asphalt during the water solution soaking process is tested by virtue of the electrochemical workstation having an alternating current impedance test function, electrochemical parameters of the asphalt are observed when the asphalt is completely soaked, and the appearing time of the electrochemical parameters of the asphalt when the asphalt is completely soaked is recorded, so that the anti-penetrability performance of the asphalt is evaluated according to the length of the time.
Description
Technical field
The utility model belongs to the technical field of pitch anti-permeability performance test, is specifically related to a kind of pitch anti-permeability performance test working electrode.
Background technology
Pitch is used widely in road engineering, but bituminous pavement is in long-term immersion situation, and moisture can infiltrate asphalt membrane and diffuse to pitch-aggregate Interface place, thereby asphalt membrane is peeled off from surface of aggregate, causes the asphaltic road-mix surface course structural failure; In addition, the moisture infiltration can cause the change of asphaltic nature, and pitch self cohesion is reduced, and then affects the water stability of asphaltic road-mix surface course.
At present, about the method for testing of pitch anti-permeability performance, provide the method for stability of asphalt mixture test to be the experiment of immersion Marshall and Immersion Wheel Truck Test in " highway engineering pitch and Asphalt Mixture Experiment rules " (JTG E20-2011).Marshall Test wherein soaks, that the asphalt shaping test piece is immersed the Water Tank with Temp.-controlled certain hour, situation of change by degree of stability before and after the immersion of mensuration test specimen, estimate the water stability of asphalt, this test method to pitch and the susceptibility of gathering materials a little less than, and its test loads and mechanical meaning is indefinite, can't estimate accurately, really the water stability of asphalt.
Immersion Wheel Truck Test is at the actual traffic load of immersion condition Imitating, rut degree by test mixing material shaping test piece, estimate the water stability of asphalt, although the method is high than other method accuracy, the true water stability that can reflect to a certain extent asphalt, but the method complicated operation is loaded down with trivial details, and can't reflect infiltration and the dispersal behavior of moisture pitch from microcosmic angle.
Summary of the invention
The purpose of this utility model is to provide a kind of working electrode used when utilizing electrochemical workstation test pitch anti-permeability performance, utilizes the anti-permeability performance of electrochemical workstation test pitch with effective realization.
For this reason, the utility model provides when utilizing electrochemical workstation test pitch anti-permeability performance, and working electrode used comprises a sheet metal, and this sheet metal is provided with and is coated with the workplace that carries asphalt membrane and the insulating surfaces that is electrically connected to electrochemical workstation.
Other technologies of the present utility model are characterized as:
Above-mentioned sheet metal is circular or foursquare sheet metal, and the thickness of this sheet metal is 1.00～2.00mm, and on it, area of workplace is 100～400mm
2
Be connected with wire on above-mentioned insulating surfaces, and be coated with insulating material on this insulating surfaces.
When using working electrode of the present utility model that the anti-permeability performance of pitch is tested, test the anti-permeability performance of pitch by the variation of monitoring pitch electrochemical properties in the aqueous solution soaking process, specifically by the electrochemical properties of electrochemical workstation test pitch in the aqueous solution soaking process that possesses the ac impedance measurement function, electrochemical parameter when being permeated fully by observation pitch, and the time of the electrochemical parameter of record when this pitch occurring and being permeated fully, estimate the quality of pitch anti-permeability performance with the length of this time.
Description of drawings
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
Fig. 1 is the structural representation of working electrode of the present utility model;
Fig. 2 be when in embodiment 1, asphalt membrane to be measured soaks beginning and soaks 1h, 3h, 5h the logf-log|Z| curve and
The combination stacking diagram of curve;
Fig. 3 be when in embodiment 1, asphalt membrane to be measured soaks 5.5h, 6h, 6.5h the logf-log|Z| curve and
The combination stacking diagram of curve.
Embodiment
With reference to figure 1, of the present utility model when utilizing electrochemical workstation test pitch anti-permeability performance working electrode used comprise a circular or foursquare sheet metal 3, this sheet metal 3 is provided with and is coated with the workplace 6 that carries asphalt membrane 4 and the insulating surfaces 5 that is electrically connected to electrochemical workstation, the thickness of described sheet metal 3 is 1.00～2.00mm, and the area of described workplace 6 is 100～400mm
2, be coated with insulating material 2 on insulating surfaces 5, and be connected with wire 1 on this insulating surfaces 5.
Be below the preparation process of this working electrode of providing of inventor, be described in further detail with the structure to working electrode of the present utility model.
1) metal sheet (stainless steel substrates, copper sheet or steel disc) is cut, is polished into smooth square or circular, for the ease of the accuracy of experiment test and result, its area is 100～400mm
2, thickness is 1.00～2.00mm;
2) use soldering in the one side of described sheet metal in wire (rubber insulated coppor wire), and wrap this face, sheet metal surrounding and the exposed copper cash of weld with insulating material;
3) after insulating material solidified, the sheet metal of again polishing did not wrap the workplace that face namely applies asphalt membrane.
When utilizing the electrochemical properties of electrochemical workstation test asphalt membrane in aqueous solution, due to the specific inductive capacity of the moisture specific inductive capacity much larger than pitch, so infiltrate in the asphalt membrane process at moisture, along with the infiltration asphalt membrane resistance of moisture reduces gradually, resistance reduces trend and the depth of penetration of moisture, and to increase trend consistent; During to working electrode, the workplace of working electrode and the reaction of contact with moisture corrosion form the corrosion micro cell when moisture infiltrate asphalt membrane, at this moment,
Trough appears in curve, and the logf-log|Z| curve is also followed and platform occurred.
Specifically utilize working electrode of the present utility model to carry out pitch anti-permeability performance method of testing as follows:
When using this working electrode test pitch anti-permeability performance, concrete operations are as follows:
With reference to shown in Figure 1, with the thick asphalt membrane to be measured 4 of cooling rear formation 200～400 μ m of (120-140 ℃) bitumen coated to be measured room temperature on the workplace 6 of working electrode of heat;
With contrast electrode, auxiliary electrode and working electrode respectively with after electrochemical workstation is electrically connected to, again described contrast electrode, auxiliary electrode and working electrode are inserted in aqueous solution, make above-mentioned three kinds of electrodes consist of the closed-loop path, described contrast electrode can be selected mercurous chloride electrode, silver | silver chloride electrode and mercury | and mercuric oxide electrode, described auxiliary electrode can be selected platinum black electrode, graphite electrode and inert metal electrode, and the asphalt membrane on working electrode is over against auxiliary electrode;
The operating voltage of setting electrochemical workstation is ± 5mV, frequency of operation f are [a, b], and a≤10
-2Hz, b 〉=10
4Hz is every time T (impedance Z and the phasing degree of the test of 0＜T≤60min) asphalt membrane to be measured
And utilize each test value, take logf as horizontal ordinate, log|Z| makes the logf-log|Z| curve as ordinate, simultaneously, take logf as horizontal ordinate, the phasing degree
For ordinate is done
Curve;
When the data that record for certain time, in a horizontal ordinate section:
Occur trough in curve, when platform occurring on the logf-log|Z| curve, record should
The corresponding test duration α of curve T, the anti-permeability performance of the longer explanation of this test duration α T pitch to be tested is better.
Below the embodiment that the inventor provides, so that technical scheme of the present invention is further explained explanation.
Embodiment 1:
This embodiment tests the anti-permeability performance of 70# petroleum bitumen (pen. (25 ℃, 5s, 100g) is 6.3mm, and softening point is 52.3 ℃, and 25 ℃ of ductilities are 142cm):
The 70# petroleum bitumen of heat is coated on the workplace of working electrode and forms after cooling the 300 thick asphalt membranes of μ m on workplace;
Contrast electrode, auxiliary electrode and working electrode respectively with after electrochemical workstation is electrically connected to, then are immersed described contrast electrode, auxiliary electrode and working electrode in aqueous solution, make above-mentioned three kinds of electrodes consist of the closed-loop path; Contrast electrode used is mercurous chloride electrode, and auxiliary electrode is platinum black electrode, and the asphalt membrane on working electrode is over against the auxiliary electrode platinized platinum; Aqueous temperature used is that 60 ℃, the massfraction of NaCl are 3.5%, H
2SO
4Amount of substance concentration be 0.5 * 10
-4(the NaCl+H of mol/L
2SO
4) aqueous solution;
The operating voltage of setting electrochemical workstation is ± 5mV, frequency of operation f are [10
-3, 10
6], every impedance Z and the phasing degree of time T=0.5h test asphalt membrane to be measured
And utilize each test value, do logf-log|Z| curve and
Curve map, choose and can embody pitch to be measured part relations figure of electrochemical properties variation tendency in aqueous solution and carry out following analysis:
In Fig. 2 and Fig. 3, horizontal ordinate logf is that the zone of [3,0] is that low frequency range, logf are that intermediate frequency zone, logf are high frequency region for the zone of [3,6] for the zone of [0,3]; In figure, logf-log|Z| curve low frequency range platform is corresponding | and the Z| value is that resistance value, the high frequency region platform of asphalt membrane is corresponding | and the Z| value is the resistance value of aqueous solution.
Fig. 2 be the logf-log|Z| curve and
The combination stacking diagram of curve, the AC impedance Bode that is asphalt membrane to be measured schemes; In this figure, curve i, curve ii, curve iii and curve iv are respectively the logf-log|Z| curve when soaking 0h, 1h, 3h and 5h, and curve i ', curve ii ', curve iii ' and curve iv ' are respectively when soaking 0h, 1h, 3h and 5h
Curve.
By interpretation of result shown in Figure 2 as can be known: extend with soak time, logf-log|Z| curve low frequency range platform is acceleration and moves down trend, show and extend with soak time that the asphalt membrane resistance value reduces and to reduce amplitude increasing, namely moisture just begins to infiltrate asphalt membrane after asphalt membrane immerses aqueous solution, and depth of penetration is with the prolongation of soak time the increase trend of accelerating.
As shown in Figure 3, curve v ', curve vi ' and curve vii ' are respectively when soaking 5.5h, 6h and 6.5h
Curve, curve v, curve vi and curve vii are respectively the logf-log|Z| curve when soaking 5.5h, 6h and 6.5h.Soak as can be seen from Figure 3 afterwards all of 5.5h
Curve has trough to occur, and corresponding logf-log|Z| curve is attended by platform and occurs, wherein: soak 5.5h's
Trough peace platform appears respectively in curve and logf-log|Z| curve in the zone that logf is [2.4,3.3], soak 6h's
Trough peace platform appears respectively in curve and logf-log|Z| curve in the zone that logf is [1.9,3.2], soak 6.5h's
Curve and logf-log|Z| curve are [1.7 at logf, 2.9] the zone trough peace platform appears respectively, after showing immersion 5.5h, moisture has diffused to asphalt membrane/steel disc at the interface, this shows when soaking 5.5h, the asphalt membrane subregion is permeated fully by moisture, and asphalt membrane begins to be peeled off by water from this moment;
By Fig. 3 also as can be known, continue to be with soak time prolongation logf-log|Z| curve low frequency range platform and accelerate to move down trend, be that the asphalt membrane resistance value also reduces continuing, thus as can be known in this section period asphalt membrane is being accelerated expansion by the moisture penetration zone extending with soak time.
To sum up analyze, the thick 70# petroleum bitumen film of 300 μ m is that 60 ℃, the massfraction of NaCl are 3.5%, H in temperature
2SO
4Amount of substance concentration be 0.5 * 10
-4(the NaCl+H of mol/L
2SO
4) soak in aqueous solution, moisture just begins to infiltrate in asphalt membrane after asphalt membrane immerses aqueous solution, and moisture depth of penetration in asphalt membrane is with the prolongation of soak time and accelerates increase trend, and moisture permeates asphalt membrane subregion spent time α T=5.5h fully.
Embodiment 2:
This embodiment tests the anti-permeability performance of following three kinds of pitches:
70# petroleum bitumen: pen. (25 ℃, 5s, 100g) is 6.3mm, and softening point is 52.3 ℃, and 25 ℃ of ductilities are 142cm;
90# petroleum bitumen: pen. (25 ℃, 5s, 100g) is 8.8mm, and softening point is 46.5 ℃, and 25 ℃ of ductilities are 160cm;
The SBR modified bitumen: pen. (25 ℃, 5s, 100g) is 7.5mm, and softening point is 49.8 ℃, and 25 ℃ of ductilities are 165cm;
This embodiment difference from Example 1 is, its test parameter is: pitch thickness 400 μ m, the aqueous solution when soaking are 70 ℃.
The various pitch anti-permeability performance of this embodiment test result is as follows:
70# petroleum bitumen: α T=5.5h;
90# petroleum bitumen: α T=6.0h;
SBR modified bitumen: α T=8.5h.
Can be found out by the above results, it is 5.5h and 6.0h that spent time is permeated fully by moisture in 70# petroleum bitumen film and 90# petroleum bitumen membrane portions zone, and namely above-mentioned two kinds of pitch anti-permeability performances are substantially suitable, and wherein 90# petroleum bitumen impermeability slightly well; In addition, it is 8.5h that required time is permeated fully by moisture in SBR modified bitumen membrane portions zone, obviously is longer than 70# petroleum bitumen and 90# petroleum bitumen, and namely SBR modified bitumen anti-permeability performance is best.
Claims (3)
1. working electrode used when utilizing electrochemical workstation test pitch anti-permeability performance, it is characterized in that, this working electrode comprises a sheet metal (3), and this sheet metal (3) is provided with and is coated with the workplace (6) that carries asphalt membrane and the insulating surfaces (5) that is electrically connected to electrochemical workstation.
2. working electrode as claimed in claim 1, is characterized in that, described sheet metal is circular or foursquare sheet metal (3), and the thickness of described sheet metal (3) is 1.00～2.00mm, and the area of described workplace (6) is 100～400mm
2
3. working electrode as claimed in claim 2, is characterized in that, is connected with wire (1) on described insulating surfaces (5), and is coated with insulating material (2) on this insulating surfaces (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220707882 CN202994716U (en) | 2012-12-19 | 2012-12-19 | Working electrode used during testing of anti-penetrability performance of asphalt by utilizing electrochemical workstation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220707882 CN202994716U (en) | 2012-12-19 | 2012-12-19 | Working electrode used during testing of anti-penetrability performance of asphalt by utilizing electrochemical workstation |
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|---|---|
| CN202994716U true CN202994716U (en) | 2013-06-12 |
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| CN 201220707882 Withdrawn - After Issue CN202994716U (en) | 2012-12-19 | 2012-12-19 | Working electrode used during testing of anti-penetrability performance of asphalt by utilizing electrochemical workstation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123330A (en) * | 2012-12-19 | 2013-05-29 | 长安大学 | Method for testing asphalt anti-penetrability performance |
-
2012
- 2012-12-19 CN CN 201220707882 patent/CN202994716U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123330A (en) * | 2012-12-19 | 2013-05-29 | 长安大学 | Method for testing asphalt anti-penetrability performance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130612 Effective date of abandoning: 20140813 |
|
| RGAV | Abandon patent right to avoid regrant |